CAPE Pure Mathematics Unit 2 · May/June 2018 · Paper 1 · Question Q11
\int (\cos 5x \cos 3x)\,dx =
- (A)
\int (\cos 8x + \cos 2x)\,dx - (B)
\int (\cos 8x - \cos 2x)\,dx - (C)
\frac{1}{2}\int (\cos 8x + \cos 2x)\,dx - (D)
\frac{1}{2}\int (\cos 8x - \cos 2x)\,dx
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