Find the Derivative Of $f ( x ) = \sin ^ { 2 } x$

Multiple Choice

Find the derivative of $f ( x ) = \sin ^ { 2 } x$ .

A) 2cos x
B) cos( $x ^ { 2 }$ )
C) 2sin x
D) $\cos ^ { 2 } x$
E) $2 \cos ^ { 2 } x$
F) $2 \cos \left( x ^ { 2 } \right)$
G) $2 \sin x \cos x$
H) $- 2 \sin x \cos x$