Use Identities to Find the Exact Value $$\cos \frac { 7 \pi } { 12 } \cos \frac { 5 \pi } { 12 } + \sin \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 }$$

Multiple Choice

Use Identities to find the exact value.
- $$\cos \frac { 7 \pi } { 12 } \cos \frac { 5 \pi } { 12 } + \sin \frac { 7 \pi } { 12 } \sin \frac { 5 \pi } { 12 }$$

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