CAPE Pure Mathematics Unit 1 · May/June 2014 · Paper 1 · Question Q25
The expression \sin\left(\alpha + \frac{\pi}{4}\right) is equivalent to
- (A)
\frac{1}{\sqrt{2}}(\sin\alpha + \cos\alpha) - (B)
\frac{1}{\sqrt{2}}(\cos\alpha - \sin\alpha) - (C)
\frac{1}{2}(\sin\alpha - \cos\alpha) - (D)
\frac{1}{2}(\cos\alpha + \sin\alpha)
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