Use Sum and Difference Formulas for Cosines and Sines
- $\sin 195 ^ { \circ } \cos 75 ^ { \circ } - \cos 195 ^ { \circ } \sin 75 ^ { \circ }$

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\sin 195 ^ { \circ } \cos 75 ^ { \circ } - \cos 195 ^ { \circ } \sin 75 ^ { \circ }$

A) $\frac { \sqrt { 3 } } { 2 }$
B) $- \frac { 1 } { 2 }$
C) $\frac { 13 } { 4 }$
D) $- \frac { \sqrt { 3 } } { 2 }$