Use Identities to Write Each Expression as a Function of $$\cos \left( \theta + 270 ^ { \circ } \right)$$

Multiple Choice

Use identities to write each expression as a function of .
- $$\cos \left( \theta + 270 ^ { \circ } \right)$$

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