Trigonometric Identities and Equations
x

Angles, periods and reference angles

Angles, periods and reference angles

Unit circle on x-y axes with quadrants labelled by CAST, a reference angle in Quadrant I, and signs for sine, cosine and tangent

In AS questions, trigonometric equations are usually solved in degrees, so check your calculator is in degree mode first. The unit circle shows why one trig value can match more than one angle in a full turn.

Trigonometric Identities and Equations Lesson

  1. AS Level
  2. /Maths
  3. /Trigonometric Identities and Equations