Find the Exact Value of the Expression A) $\frac { 1 } { 2 }$

Find the exact value of the expression.
- $\cos \left( \frac { 7 \pi } { 12 } \right) \cos \left( \frac { 5 \pi } { 12 } \right) + \sin \left( \frac { 7 \pi } { 12 } \right) \sin \left( \frac { 5 \pi } { 12 } \right)$

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

Correct Answer:

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