Use the Appropriate Addition Formula to Find the Exact Value $\tan \left( - \frac { 7 \pi } { 12 } \right)$

Multiple Choice

Use the appropriate addition formula to find the exact value of the expression.
- $\tan \left( - \frac { 7 \pi } { 12 } \right)$

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