Use Sum and Difference Formulas for Cosines and Sines
- $\cos \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 } - \cos \frac { 5 \pi } { 12 } \sin \frac { 7 \pi } { 12 }$

Multiple Choice

Use Sum and Difference Formulas for Cosines and Sines
- $\cos \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 } - \cos \frac { 5 \pi } { 12 } \sin \frac { 7 \pi } { 12 }$

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