ASMathsOCRMaths APureRevision NotesTrigonometryTrigonometric EquationsStrategy for Trigonometric Equations

Strategy for Trigonometric Equations (OCR AS Maths A: Pure): Revision Note

Exam code: H230

Written by: Lucy Kirkham

Reviewed by: Dan Finlay

Updated on 2 July 2026

Strategy for Trigonometric Equations

How to approach solving trig equations

You can solve trig equations in a variety of different ways
- Sketching a graph (see Graphs of Trigonometric Functions)
- Using trigonometric identities (see Trigonometry – Simple Identities)
- Using the CAST diagram (see Linear Trigonometric Equations)
- Factorising quadratic trig equations (see Quadratic Trigonometric Equations)
If you’re having trouble solving a trig equation, this flowchart might help:

Strategy for Trigonometric Equations Diagram 1, A Level & AS Level Pure Maths Revision Notes

Examiner Tips and Tricks

Don’t forget to check the function range and ensure you have included all possible solutions.
If the question involves a function of x or θ, make sure you transform the range first (and ensure you transform your solutions back again at the end!).

Worked Example

Strategy for Trigonometric Equations Example Solution, A Level & AS Level Pure Maths Revision Notes

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