Use a Sum or Difference Identity to Find the Exact $\sin 255 ^ { \circ }$

Use a sum or difference identity to find the exact value.
- $\sin 255 ^ { \circ }$

A) $\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }$
B) $\frac { \sqrt { 6 } + \sqrt { 2 } } { 4 }$
C) $\frac { - \sqrt { 6 } + \sqrt { 2 } } { 4 }$
D) $\frac { - \sqrt { 6 } - \sqrt { 2 } } { 4 }$

Correct Answer:

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