Write the Expression as the Sine, Cosine, or Tangent of a Double

Multiple Choice

Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression.
- $$\frac { 2 \tan \frac { 7 \pi } { 12 } } { 1 - \tan ^ { 2 } \frac { 7 \pi } { 12 } }$$

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