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Trigonometry and Modelling

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Question 31

Prove the identity:

cos⁡x−sin⁡x≡cos⁡2xcos⁡x+sin⁡x \cos x - \sin x \equiv \frac{\cos 2x}{\cos x + \sin x} cosx−sinx≡cosx+sinxcos2x​
[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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