Mathematics

Problem

|\mathbf{a}+\mathbf{b}|^{2}=|\mathbf{a}|^{2}+|\mathbf{b}|^{2}

for non-zero vectors

\mathbf{a}

and

\mathbf{b}

, then the angle between

\mathbf{a}

and

\mathbf{b}

is a)

0^{\circ}

60^{\circ}

90^{\circ}

180^{\circ}