Given M=(cos(30∘)−sin(30∘)sin(30∘)cos(30∘))M = \begin{pmatrix} \cos(30^\circ) & -\sin(30^\circ) \\ \sin(30^\circ) & \cos(30^\circ) \end{pmatrix}M=(cos(30∘)sin(30∘)−sin(30∘)cos(30∘)), what is M3M^3M3?
Rotation by 90∘90^\circ90∘
Rotation by 60∘60^\circ60∘
Rotation by 120∘120^\circ120∘
Identity matrix