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

Use identities to write the expression as a single function of x or $$\theta$$
- $\sin \left( \frac { \pi } { 4 } - x \right)$

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

Correct Answer:

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