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Use a Sum or Difference Identity to Find the Exact $\sin 10 ^ { \circ } \cos 110 ^ { \circ } + \cos 10 ^ { \circ } \sin 110 ^ { \circ }$

Question 479

Question 479

Multiple Choice

Use a sum or difference identity to find the exact value.
- $\sin 10 ^ { \circ } \cos 110 ^ { \circ } + \cos 10 ^ { \circ } \sin 110 ^ { \circ }$

A) $\frac { \sqrt { 3 } } { 2 }$
B) $- \frac { \sqrt { 3 } } { 2 }$
C) $- \frac { 1 } { 2 }$
D) $\frac { 1 } { 6 }$

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