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Use a Sum or Difference Identity to Find the Exact sin⁡260∘cos⁡20∘−cos⁡260∘sin⁡20∘\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }

Question 458

Multiple Choice

Use a sum or difference identity to find the exact value.
- sin⁡260∘cos⁡20∘−cos⁡260∘sin⁡20∘\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }


A) −12- \frac { 1 } { 2 }
B) −133- \frac { 13 } { 3 }
C) −32- \frac { \sqrt { 3 } } { 2 }
D) 32\frac { \sqrt { 3 } } { 2 }

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