GCSE Maths (Edexcel)

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The Inverse Trigonometric Functions

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Geometry and Measures Mensuration and Calculation

The Inverse Trigonometric Functions

4:32 Trigonometric Calculations
Spec G20
Previous Using the Trigonometric Functions Next Using Trig Functions in Other Shapes
  • Inverse trigonometric functions do the opposite of regular trigonometric functions
  • The three inverse trig functions are inverse sine, inverse cosine, and inverse tangent
  • They can be used to calculate angles in right angle triangles
  • The specific inverse trig function to use depends on the given sides of the triangle
  • Example: Given sides of length 12cm and 7cm, use inverse tangent to calculate the angle theta
  • Input the given side lengths into the equation and use the inverse tan button on a calculator
  • The result will be the value of theta in degrees, rounded to three significant figures

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