Use a Sum or Difference Identity to Find the Exact $\sin ( x + 2 \pi )$

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\sin ( x + 2 \pi )$

A) $- \cos x$
B) $\frac { \sqrt { 2 } } { 2 } \cos x + \frac { \sqrt { 2 } } { 2 } \sin x$
C) $\sin x$
D) $\frac { \sqrt { 2 } } { 2 } \cos x - \frac { \sqrt { 2 } } { 2 } \sin x$