a Prove that (cos 2 sin 2) 2 1 sin 4 b Use the result to solve, for 0 , the equation cos 2 sin 2 1 2 Give your answers in terms of ...

a To prove that cos 2 sin 22 1 sin 4 well start by expanding the lefthand side and then simplifying ...

a. Prove that (cos 2 sin 2) 2 1 sin 4. b. Use the

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a. Prove that (cos 2θ − sin 2θ)² ≡ 1 − sin 4θ.

b. Use the result to solve, for 0 ≤ θ < π, the equation cos 2θ − sin 2θ = 1/√2. Give your answers in terms of π.

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

ISBN: 9781292183404

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Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran

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a. Prove that (cos 2 sin 2) 2 1 sin 4. b. Use the

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Pearson Edexcel A Level Mathematics Pure Mathematics Year 2

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