Obtain the angle between and if and .

MATHEMATICS · Subjective · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Obtain the angle between

\mathbf{a}+\mathbf{b}

and

\mathbf{a}-\mathbf{b}

\mathbf{a}=2\hat{i}+3\hat{j}

and

\mathbf{b}=\hat{i}-2\hat{j}