Let $y = e ^ { x } \cos x$ Then $y \prime\prime$

Multiple Choice

Let $y = e ^ { x } \cos x$ Then $y \prime\prime$ is

A) $- 2 e ^ { x } \sin x$
B) $- 2 e ^ { x } \cos x$
C) $2 e ^ { x } \sin x$
D) $2 e ^ { x } \sin x$ .
E) $e ^ { x } ( \sin x - \cos x )$