Use a Sum or Difference Identity to Find the Exact $\sin 255 ^ { \circ } \cos 15 ^ { \circ } - \cos 255 ^ { \circ } \sin 15 ^ { \circ }$

question 87

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\sin 255 ^ { \circ } \cos 15 ^ { \circ } - \cos 255 ^ { \circ } \sin 15 ^ { \circ }$

• A) \(\frac { \sqrt { 3 } } { 2 }\)
• B) \(- \frac { 1 } { 2 }\)
• C) \(- \frac { 17 } { 4 }\)
• D) \(- \frac { \sqrt { 3 } } { 2 }\)

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