Mathematics

Problem

Let

\mathbf{a}=\langle 2,-3,1\rangle

and

\mathbf{b}=\langle 4,0,-2\rangle

. Find, to the nearest whole degree, the angle between

\mathbf{a}

and

\mathbf{b}

. a)

54^\circ

120^\circ

69^\circ

35^\circ