Verify That Each Equation Is an Identity $$\sin ^ { 3 } ( 3 x ) = \frac { 1 } { 2 } ( \sin ( 3 x ) ) ( 1 - \cos ( 6 x ) )$$

Essay

Verify that each equation is an identity.
- $$\sin ^ { 3 } ( 3 x ) = \frac { 1 } { 2 } ( \sin ( 3 x ) ) ( 1 - \cos ( 6 x ) )$$