The non-zero vectors

MATHEMATICS · Single correct · A Level · Mathematics · Vectors · Vectors

Problem

The non-zero vectors a\mathbf{a} , b\mathbf{b} and c\mathbf{c} are related by a=8b\mathbf{a} = 8\mathbf{b} and c=−7b\mathbf{c} = -7\mathbf{b} . Then, the angle between a\mathbf{a} and c\mathbf{c} is (1) π\pi (2) 00 (3) π4\frac{\pi}{4} (4) π2\frac{\pi}{2}

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