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


A) 12\frac { 1 } { 2 }
B) 32\frac { \sqrt { 3 } } { 2 }
C) 33\frac { \sqrt { 3 } } { 3 }
D) 2312\frac { 23 } { 12 }

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