CAPE Pure Mathematics Unit 1 · May/June 2015 · Paper 1 · Question Q29

The cosine of the angle between the vectors -6\mathbf{j} and \mathbf{i} + \mathbf{j} is

1. (A)-\frac{1}{\sqrt{2}}
2. (B)\frac{1}{\sqrt{2}}
3. (C)-\frac{5}{\sqrt{2}}
4. (D)\frac{6}{\sqrt{2}}