Let $f ( x ) = \sinh \left( x ^ { 2 } \right)$

Multiple Choice

Let $f ( x ) = \sinh \left( x ^ { 2 } \right)$ Then $f ^ { \prime } ( x )$ is

A) $2 \cosh ( 2 x )$
B) $2 x \cosh ( 2 x )$
C) $2 x \cosh \left( x ^ { 2 } \right)$
D) $- 2 x \cosh \left( x ^ { 2 } \right)$
E) $- 2 \cosh \left( x ^ { 2 } \right)$