Use Sum and Difference Formulas for Cosines and Sines
- $\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }$

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\sin 260 ^ { \circ } \cos 20 ^ { \circ } - \cos 260 ^ { \circ } \sin 20 ^ { \circ }$

A) $- \frac { \sqrt { 3 } } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $\frac { 13 } { 3 }$
D) $\frac { \sqrt { 3 } } { 2 }$