Mathematics

Problem

Let the vectors

\mathbf{a}

and

\mathbf{b}

be such that

|\mathbf{a}| = 3

|\mathbf{b}| = \frac{\sqrt{2}}{3}

and

\mathbf{a} \times \mathbf{b}

is a unit vector, then find the angle between

\mathbf{a}

and

\mathbf{b}