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Trigonometry and Modelling

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Question 131

Prove the identity:

cos⁡3x−sin⁡3xcos⁡x+sin⁡x≡1−4sin⁡xcos⁡x \frac{\cos 3x-\sin 3x}{\cos x + \sin x} \equiv 1-4\sin x\cos x cosx+sinxcos3x−sin3x​≡1−4sinxcosx
[4]
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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