a. Using the identity cos (A + B) cos A cos B sin A sin
Question:
a. Using the identity cos (A + B) ≡ cos A cos B − sin A sin B, show that cos 2A ≡ cos2 A − sin2 A.
b. Hence show that:
i. cos 2A ≡ 2 cos2 A − 1
ii. cos 2A ≡ 1 − 2 sin2 A
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a cos 2A cos A cos A sin Asin A cos A sin A ...View the full answer
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Related Book For 
Pearson Edexcel A Level Mathematics Pure Mathematics Year 2
ISBN: 9781292183404
1st Edition
Authors: Greg Attwood, Jack Barraclough, Ian Bettison, David Goldberg, Alistair Macpherson, Joe Petran
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