A-level Mathematics 9709: Trigonometric identities example 3

A-level 9709 syllabus, topic 3.3 Trigonometry: Use trigonometrical identities for the simplification and exact evaluation of expressions, and in the course of solving equations, and select an identity or identities appropriate to the context, showing familiarity in particular with the use of Pythagorean identities, compound angle identities and double angle identities.

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