Find the Derivative Of $f ( x ) = \sin ^ { 3 } x$

Multiple Choice

Find the derivative of $f ( x ) = \sin ^ { 3 } x$ .

A) $3 \cos ^ { 2 } x$
B) $\cos \left( 3 x ^ { 2 } \right)$
C) $3 \sin ^ { 2 } x$
D) $3 \sin ^ { 2 } x \cos x$
E) $3 x ^ { 2 } \sin x$
F) $3 x ^ { 2 } \cos \left( x ^ { 3 } \right)$
G) $3 x ^ { 2 } \cos x$
H) None of these