Use a Sum or Difference Identity to Find the Exact $\sin 215 ^ { \circ } \cos 95 ^ { \circ } - \cos 215 ^ { \circ } \sin 95 ^ { \circ }$

Use a sum or difference identity to find the exact value.
- $\sin 215 ^ { \circ } \cos 95 ^ { \circ } - \cos 215 ^ { \circ } \sin 95 ^ { \circ }$

A) $- \frac { \sqrt { 3 } } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $\frac { 43 } { 12 }$
D) $\frac { \sqrt { 3 } } { 2 }$

Correct Answer:

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