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Trigonometric Identities and Equations
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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. A Level
  2. /Maths
  3. /Trigonometric Identities and Equations

Step-by-step lessons on Edexcel A Level Maths Trigonometric Identities and Equations, covering 10.1 Angles in all four Quadrants, 10.2 Exact Values of Trigonometric Ratios, 10.3 Trigonometric Identities, 10.4 Solving Trigonometric Equations, 10.5 Harder Trigonometric Equations, and 10.6 Equations and Identities. Each one builds up to exam-style questions. Build fluency with the core pure algebra and calculus toolkit early, since almost every mechanics and statistics topic on the course depends on it.

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