Use a Sum or Difference Identity to Find the Exact $\sin 115 ^ { \circ } \cos 55 ^ { \circ } - \cos 115 ^ { \circ } \sin 55 ^ { \circ }$

question 427

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\sin 115 ^ { \circ } \cos 55 ^ { \circ } - \cos 115 ^ { \circ } \sin 55 ^ { \circ }$

• A) \(\frac { 1 } { 2 }\)
• B) \(\frac { \sqrt { 3 } } { 2 }\)
• C) \(\frac { \sqrt { 3 } } { 3 }\)
• D) \(\frac { 23 } { 12 }\)

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