Mathematics

Problem

Let

\vec{u}=2\mathbf{i}-\mathbf{j}+2\mathbf{k}

and

\vec{v}=\mathbf{i}+2\mathbf{j}+2\mathbf{k}

. The angle between

\vec{u}

and

\vec{v}

is closest to a)

60^\circ

63^\circ

45^\circ

53^\circ