Use Identities to Find the Exact Value $\cos \left( \frac { \pi } { 12 } \right)$

Use Identities to find the exact value.
- $\cos \left( \frac { \pi } { 12 } \right)$

A) $\frac { - \sqrt { 6 } - \sqrt { 2 } } { 4 }$
B) $\frac { \sqrt { 6 } - \sqrt { 2 } } { 4 }$
C) $\frac { \sqrt { 2 } - \sqrt { 6 } } { 4 }$
D) $\frac { \sqrt { 6 } + \sqrt { 2 } } { 4 }$

Correct Answer:

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