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DP IB Maths: AA HL

Revision Notes

Home / IB / Maths: AA HL / DP / Revision Notes / 3. Geometry & Trigonometry / 3.5 Trigonometric Functions & Graphs / 3.5.1 Graphs of Trigonometric Functions


3.5.1 Graphs of Trigonometric Functions


Graphs of Trigonometric Functions

What are the graphs of trigonometric functions?

  • The trigonometric functions sin, cos and tan all have special periodic graphs
  • You’ll need to know their properties and how to sketch them for a given domain in either degrees or radians
  • Sketching the trigonometric graphs can help to
    • Solve trigonometric equations and find all solutions
    • Understand transformations of trigonometric functions

 

What are the properties of the graphs of sin x and cos x?

  • The graphs of sin x and cos x are both periodic
    • They repeat every 360° (2π radians)
    • The angle will always be on the x-axis
      • Either in degrees or radians
  • The graphs of sin x and cos x are always in the range -1 ≤ y ≤ 1
    • Domain: open curly brackets bold italic x blank vertical line blank bold italic x blank element of blank straight real numbers close curly brackets
    • Range: open curly brackets bold italic y blank vertical line minus 1 blank less or equal than space bold italic y blank less or equal than space 1 close curly brackets
    • The graphs of sin x and cos x are identical however one is a translation of the other
      • sin x passes through the origin
      • cos x passes through (0, 1)
  • The amplitude of the graphs of sin x and cos x is 1

What are the properties of the graph of tan x?

  • The graph of tan x is periodic
    • It repeats every 180° (π radians)
    • The angle will always be on the x-axis
      • Either in degrees or radians
  • The graph of tan x is undefined at the points ± 90°, ± 270° etc
    • There are asymptotes at these points on the graph
    • In radians this is at the points ± begin mathsize 16px style straight pi over 2 end style, ± begin mathsize 16px style fraction numerator 3 straight pi over denominator 2 end fraction end style etc
  • The range of the graph of tan x is
    • Domain: open curly brackets bold italic x blank vertical line blank bold italic x blank not equal to bold italic pi over 2 plus bold italic k bold italic pi comma blank bold italic k blank element of blank straight real numbers close curly brackets 
    • Range: open curly brackets bold italic y blank vertical line blank bold italic y blank element of blank straight real numbers close curly brackets

Graphs of Trigonometric Functions Diagram 1

How do I sketch trigonometric graphs?

  • You may need to sketch a trigonometric graph so you will need to remember the key features of each one
  • The following steps may help you sketch a trigonometric graph
    • STEP 1: Check whether you should be working in degrees or radians
      • You should check the domain given for this
      • If you see π in the given domain then you should work in radians
    • STEP 2: Label the x-axis in multiples of 90°
      • This will be multiples of begin mathsize 16px style straight pi over 2 end style if you are working in radians
      • Make sure you cover the whole domain on the x-axis
    • STEP 3: Label the y-axis
      • The range for the y-axis will be – 1 ≤ y ≤ 1 for sin or cos
      • For tan you will not need any specific points on the y-axis
    • STEP 4: Draw the graph
      • Knowing exact values will help with this, such as remembering that sin(0) = 0 and
        cos(0) = 1
      • Mark the important points on the axis first
      • If you are drawing the graph of tan x put the asymptotes in first
      • If you are drawing sin x or cos x mark in where the maximum and minimum points will be
      • Try to keep the symmetry and rotational symmetry as you sketch, as this will help when using the graph to find solutions

Exam Tip

  • Sketch all three trig graphs on your exam paper so you can refer to them as many times as you need to!

Worked Example

Sketch the graphs of y = cosθ and y = tanθ on the same set of axes in the interval -π ≤ θ ≤ 2π. Clearly mark the key features of both graphs.

aa-sl-3-5-1-graphs-of-trig-functions-we-solution-1

Using Trigonometric Graphs

How can I use a trigonometric graph to find extra solutions?

  • Your calculator will only give you the first solution to a problem such as sin-1(0.5)
    • This solution is called the primary value
  • However, due to the periodic nature of the trig functions there could be an infinite number of solutions
    • Further solutions are called the secondary values
  • This is why you will be given a domain (interval) in which your solutions should be found
    • This could either be in degrees or in radians
      • If you see π or some multiple of π then you must work in radians
  • The following steps will help you use the trigonometric graphs to find secondary values
    • STEP 1: Sketch the graph for the given function and interval
      • Check whether you should be working in degrees or radians and label the axes with the key values
    • STEP 2: Draw a horizontal line going through the y-axis at the point you are trying to find the values for
      • For example if you are looking for the solutions to sin-1(-0.5) then draw the horizontal line going through the y-axis at -0.5
      • The number of times this line cuts the graph is the number of solutions within the given interval
    • STEP 3: Find the primary value and mark it on the graph
      • This will either be an exact value and you should know it
      • Or you will be able to use your calculator to find it
    • STEP 4: Use the symmetry of the graph to find all the solutions in the interval by adding or subtracting from the key values on the graph

What patterns can be seen from the graphs of trigonometric functions?

  • The graph of sin x has rotational symmetry about the origin
    • So sin(-x) = - sin(x)
    • sin(x) = sin(180° - x) or sin(π – x)
  • The graph of cos x has reflectional symmetry about the y-axis
    • So cos(-x) = cos(x)
    • cos(x) = cos(360° – x) or cos(2π – x)
  • The graph of tan x repeats every 180° (π radians)
    • So tan(x) = tan(x ± 180°) or tan(x ±  π )
  • The graphs of sin x and cos x repeat every 360° (2π radians)
    • So sin(x) = sin(x ±  360°) or sin(x  ±  2π)
    • cos(x) = cos(x ±  360°) or cos(x  ±  2π)

Exam Tip

  • Take care to always check what the interval for the angle is that the question is focused on

Worked Example

One solution to cos x = 0.5 is 60°. Find all the other solutions in the range -360° ≤ x ≤ 360°.

aa-sl-3-5-1-using-trig-graphs-we-solution-2



  • 1. Number & Algebra
    • 1.1 Number & Algebra Toolkit
      • 1.1.1 Standard Form
        • 1.1.2 Laws of Indices
          • 1.1.3 Partial Fractions
          • 1.2 Exponentials & Logs
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              • 1.2.2 Laws of Logarithms
                • 1.2.3 Solving Exponential Equations
                • 1.3 Sequences & Series
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                      • 1.3.3 Geometric Sequences & Series
                        • 1.3.4 Applications of Sequences & Series
                          • 1.3.5 Compound Interest & Depreciation
                          • 1.4 Simple Proof & Reasoning
                            • 1.4.1 Proof
                            • 1.5 Further Proof & Reasoning
                              • 1.5.1 Proof by Induction
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                                • 1.6 Binomial Theorem
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                                    • 1.7 Permutations & Combinations
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                                        • 1.8 Complex Numbers
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                                              • 1.9 Further Complex Numbers
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                                                  • 1.9.2 Forms of Complex Numbers
                                                    • 1.9.3 Complex Roots of Polynomials
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                                                        • 1.10 Systems of Linear Equations
                                                          • 1.10.1 Systems of Linear Equations
                                                            • 1.10.2 Algebraic Solutions
                                                          • 2. Functions
                                                            • 2.1 Linear Functions & Graphs
                                                              • 2.1.1 Equations of a Straight Line
                                                              • 2.2 Quadratic Functions & Graphs
                                                                • 2.2.1 Quadratic Functions
                                                                  • 2.2.2 Factorising & Completing the Square
                                                                    • 2.2.3 Solving Quadratics
                                                                      • 2.2.4 Quadratic Inequalities
                                                                        • 2.2.5 Discriminants
                                                                        • 2.3 Functions Toolkit
                                                                          • 2.3.1 Language of Functions
                                                                            • 2.3.2 Composite & Inverse Functions
                                                                              • 2.3.3 Symmetry of Functions
                                                                                • 2.3.4 Graphing Functions
                                                                                • 2.4 Other Functions & Graphs
                                                                                  • 2.4.1 Exponential & Logarithmic Functions
                                                                                    • 2.4.2 Solving Equations
                                                                                      • 2.4.3 Modelling with Functions
                                                                                      • 2.5 Reciprocal & Rational Functions
                                                                                        • 2.5.1 Reciprocal & Rational Functions
                                                                                        • 2.6 Transformations of Graphs
                                                                                          • 2.6.1 Translations of Graphs
                                                                                            • 2.6.2 Reflections of Graphs
                                                                                              • 2.6.3 Stretches Graphs
                                                                                                • 2.6.4 Composite Transformations of Graphs
                                                                                                • 2.7 Polynomial Functions
                                                                                                  • 2.7.1 Factor & Remainder Theorem
                                                                                                    • 2.7.2 Polynomial Division
                                                                                                      • 2.7.3 Polynomial Functions
                                                                                                        • 2.7.4 Roots of Polynomials
                                                                                                        • 2.8 Inequalities
                                                                                                          • 2.8.1 Solving Inequalities Graphically
                                                                                                            • 2.8.2 Polynomial Inequalities
                                                                                                            • 2.9 Further Functions & Graphs
                                                                                                              • 2.9.1 Modulus Functions
                                                                                                                • 2.9.2 Modulus Transformations
                                                                                                                  • 2.9.3 Modulus Equations & Inequalities
                                                                                                                    • 2.9.4 Reciprocal & Square Transformations
                                                                                                                  • 3. Geometry & Trigonometry
                                                                                                                    • 3.1 Geometry Toolkit
                                                                                                                      • 3.1.1 Coordinate Geometry
                                                                                                                        • 3.1.2 Radian Measure
                                                                                                                          • 3.1.3 Arcs & Sectors
                                                                                                                          • 3.2 Geometry of 3D Shapes
                                                                                                                            • 3.2.1 3D Coordinate Geometry
                                                                                                                              • 3.2.2 Volume & Surface Area
                                                                                                                              • 3.3 Trigonometry Toolkit
                                                                                                                                • 3.3.1 Pythagoras & Right-Angled Triganometry
                                                                                                                                  • 3.3.2 Non Right-Angled Trigonometry
                                                                                                                                    • 3.3.3 Applications of Trigonometry & Pythagoras
                                                                                                                                    • 3.4 Trigonometry
                                                                                                                                      • 3.4.1 The Unit Circle
                                                                                                                                        • 3.4.2 Exact Values
                                                                                                                                        • 3.5 Trigonometric Functions & Graphs
                                                                                                                                          • 3.5.1 Graphs of Trigonometric Functions
                                                                                                                                            • 3.5.2 Transformations of Trigonometric Functions
                                                                                                                                              • 3.5.3 Modelling with Trigonometric Functions
                                                                                                                                              • 3.6 Trigonometric Equations & Identities
                                                                                                                                                • 3.6.1 Simple Identities
                                                                                                                                                  • 3.6.2 Compound Angle Formulae
                                                                                                                                                    • 3.6.3 Double Angle Formulae
                                                                                                                                                      • 3.6.4 Relationship Between Trigonometric Ratios
                                                                                                                                                        • 3.6.5 Linear Trigonometric Equations
                                                                                                                                                          • 3.6.6 Quadratic Trigonometric Equations
                                                                                                                                                          • 3.7 Inverse & Reciprocal Trig Functions
                                                                                                                                                            • 3.7.1 Reciprocal Trig Functions
                                                                                                                                                              • 3.7.2 Inverse Trig Functions
                                                                                                                                                              • 3.8 Further Trigonometry
                                                                                                                                                                • 3.8.1 Trigonometric Proof
                                                                                                                                                                  • 3.8.2 Strategy for Trigonometric Equations
                                                                                                                                                                  • 3.9 Vector Properties
                                                                                                                                                                    • 3.9.1 Introduction to Vectors
                                                                                                                                                                      • 3.9.2 Position & Displacement Vectors
                                                                                                                                                                        • 3.9.3 Magnitude of a Vector
                                                                                                                                                                          • 3.9.4 The Scalar Product
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                                                                                                                                                                                    • 3.10.4 The Vector Product
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                                                                                                                                                                                          • 3.11.2 Intersections of Lines & Planes
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                                                                                                                                                                                              • 3.11.4 Shortest Distances with Planes
                                                                                                                                                                                            • 4. Statistics & Probability
                                                                                                                                                                                              • 4.1 Statistics Toolkit
                                                                                                                                                                                                • 4.1.1 Sampling & Data Collection
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                                                                                                                                                                                                    • 4.1.3 Frequency Tables
                                                                                                                                                                                                      • 4.1.4 Linear Transformations of Data
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                                                                                                                                                                                                            • 4.2 Correlation & Regression
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                                                                                                                                                                                                                    • 4.3.2 Conditional Probability
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                                                                                                                                                                                                                              • 4.5.1 The Binomial Distribution
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                                                                                                                                                                                                                                • 4.6 Normal Distribution
                                                                                                                                                                                                                                  • 4.6.1 The Normal Distribution
                                                                                                                                                                                                                                    • 4.6.2 Calculations with Normal Distribution
                                                                                                                                                                                                                                      • 4.6.3 Standardisation of Normal Variables
                                                                                                                                                                                                                                      • 4.7 Further Probability Distributions
                                                                                                                                                                                                                                        • 4.7.1 Probability Density Function
                                                                                                                                                                                                                                      • 5. Calculus
                                                                                                                                                                                                                                        • 5.1 Differentiation
                                                                                                                                                                                                                                          • 5.1.1 Introduction to Differentiation
                                                                                                                                                                                                                                            • 5.1.2 Applications of Differentiation
                                                                                                                                                                                                                                            • 5.2 Further Differentiation
                                                                                                                                                                                                                                              • 5.2.1 Differentiating Special Functions
                                                                                                                                                                                                                                                • 5.2.2 Techniques of Differentiation
                                                                                                                                                                                                                                                  • 5.2.3 Higher Order Derivatives
                                                                                                                                                                                                                                                    • 5.2.4 Further Applications of Differentiation
                                                                                                                                                                                                                                                      • 5.2.5 Concavity & Points of Inflection
                                                                                                                                                                                                                                                        • 5.2.6 Derivatives & Graphs
                                                                                                                                                                                                                                                        • 5.3 Integration
                                                                                                                                                                                                                                                          • 5.3.1 Introduction to Integration
                                                                                                                                                                                                                                                            • 5.3.2 Applications of Integration
                                                                                                                                                                                                                                                            • 5.4 Further Integration
                                                                                                                                                                                                                                                              • 5.4.1 Integrating Special Functions
                                                                                                                                                                                                                                                                • 5.4.2 Techniques of Integration
                                                                                                                                                                                                                                                                  • 5.4.3 Definite Integrals
                                                                                                                                                                                                                                                                    • 5.4.4 Further Applications of Integration
                                                                                                                                                                                                                                                                    • 5.5 Optimisation
                                                                                                                                                                                                                                                                      • 5.5.1 Modelling with Differentiation
                                                                                                                                                                                                                                                                      • 5.6 Kinematics
                                                                                                                                                                                                                                                                        • 5.6.1 Kinematics Toolkit
                                                                                                                                                                                                                                                                          • 5.6.2 Calculus for Kinematics
                                                                                                                                                                                                                                                                          • 5.7 Basic Limits & Continuity
                                                                                                                                                                                                                                                                            • 5.7.1 Basic Limits & Continuity
                                                                                                                                                                                                                                                                            • 5.8 Advanced Differentiation
                                                                                                                                                                                                                                                                              • 5.8.1 First Principles Differentiation
                                                                                                                                                                                                                                                                                • 5.8.2 Applications of Chain Rule
                                                                                                                                                                                                                                                                                  • 5.8.3 Implicit Differentiation
                                                                                                                                                                                                                                                                                    • 5.8.4 Differentiating Further Functions
                                                                                                                                                                                                                                                                                    • 5.9 Advanced Integration
                                                                                                                                                                                                                                                                                      • 5.9.1 Integrating Further Functions
                                                                                                                                                                                                                                                                                        • 5.9.2 Further Techniques of Integration
                                                                                                                                                                                                                                                                                          • 5.9.3 Integrating with Partial Fractions
                                                                                                                                                                                                                                                                                            • 5.9.4 Advanced Applications of Integration
                                                                                                                                                                                                                                                                                              • 5.9.5 Modelling with Volumes of Revolution
                                                                                                                                                                                                                                                                                              • 5.10 Differential Equations
                                                                                                                                                                                                                                                                                                • 5.10.1 Numerical Solutions to Differential Equations
                                                                                                                                                                                                                                                                                                  • 5.10.2 Analytical Solutions to Differential Equations
                                                                                                                                                                                                                                                                                                    • 5.10.3 Modelling with Differential Equations
                                                                                                                                                                                                                                                                                                    • 5.11 MacLaurin Series
                                                                                                                                                                                                                                                                                                      • 5.11.1 Maclaurin Series
                                                                                                                                                                                                                                                                                                        • 5.11.2 Maclaurin Series from Differential Equations
                                                                                                                                                                                                                                                                                                        • 5.12 Further Limits (inc l'Hôpital's Rule)
                                                                                                                                                                                                                                                                                                          • 5.12.1 Further Limits
                                                                                                                                                                                                                                                                                                        Amber Perry

                                                                                                                                                                                                                                                                                                        Author: Amber

                                                                                                                                                                                                                                                                                                        Amber gained a first class degree in Mathematics & Meteorology from the University of Reading before training to become a teacher. She is passionate about teaching, having spent 8 years teaching GCSE and A Level Mathematics both in the UK and internationally. Amber loves creating bright and informative resources to help students reach their potential.


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