CAPE Pure Mathematics Unit 1 · May/June 2011 · Paper 1 · Question Q16
The cosine of the angle between the vectors -6\,\mathbf{j} and \mathbf{i} + \mathbf{j} is
- (A)
\frac{-1}{\sqrt{2}} - (B)
\frac{-5}{\sqrt{2}} - (C)
\frac{1}{\sqrt{2}} - (D)
\frac{6}{\sqrt{2}}
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