The angle between the vectors and is

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

The angle between the vectors a=3i^+4j^+5k^\mathbf{a}=3\hat{i}+4\hat{j}+5\hat{k} and b=3i^+4j^−5k^\mathbf{b}=3\hat{i}+4\hat{j}-5\hat{k} is (1) 60∘60^\circ (2) 45∘45^\circ (3) 90∘90^\circ (4) 30∘30^\circ

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