Use Identities to Write the Expression as a Single Function $$\theta$$

Multiple Choice

Use identities to write the expression as a single function of x or $$\theta$$
- $$\cos \left( \theta + \frac { \pi } { 2 } \right)$$

A) $- \cos \theta$
B) $\sin \theta$
C) $\cos \theta$
D) $- \sin \theta$