CAPE Pure Mathematics Unit 1 · May/June 2013 · Paper 1 · Question Q26
1 + \cos^4 A - \sin^4 A =
- (A)
1 + \cos 4A - (B)
2\cos^2 A - (C)
\cos 2A - (D)
2\cos^2 A\sin^2 A
The answer is shown once you've answered.
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