a. Using cos ( + ) cos cos sin sin , or
Question:
a. Using cos (θ + α) ≡ cos θ cos α − sin θ sin α, or otherwise, show that cos 105° = √2 - √6/4.
b. Hence, or otherwise, show that sec 105° = −√a(1 + √b), where a and b are constants to be found.
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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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