a. Show that sin 3 3 sin cos 2 sin 3 . b.
Question:
a. Show that sin 3θ ≡ 3 sin θ cos2 θ − sin3 θ.
b. Show that cos 3θ ≡ cos3 θ − 3 sin2 θ cos θ.
c. Hence, or otherwise, show that tan
d. Given that θ is acute and that cos
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a Use sin 30 sin20 0 and substitute cos 20 cos s...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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