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Trigonometry and Modelling

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Question 4

Prove the identity:

cos⁡4xcos⁡2x+sin⁡2x≡cos⁡2x−sin⁡2x \frac{\cos 4x}{\cos 2x + \sin 2x} \equiv \cos 2x - \sin 2x cos2x+sin2xcos4x​≡cos2x−sin2x
[2]
Markscheme

Trigonometry and Modelling Questions

  1. A Level
  2. /Maths
  3. /Trigonometry and Modelling

348 exam-style questions on Edexcel A Level Maths Trigonometry and Modelling, covering 7.1 Addition Formulae, 7.2 Double Angle Formulae, 7.3 Solving Trigonometric Equations, 7.4 Simplifying a cos x +- b sin x, 7.5 Proving Trigonometric Identities, and 7.6 Modelling with Trigonometric Functions. Each one has a worked solution and a mark scheme showing where the marks go.

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