Use a Graph in a [ $$\left[ - 2 \pi , 2 \pi , \frac { \pi } { 2 } \right] \text { by } [ - 3,3,1 ]$$

Multiple Choice

Use a graph in a [ $$\left[ - 2 \pi , 2 \pi , \frac { \pi } { 2 } \right] \text { by } [ - 3,3,1 ]$$ 3, 3, 1] viewing rectangle to complete the identity.
- $$\frac { 2 \tan \frac { x } { 2 } } { 1 + \tan ^ { 2 } \frac { x } { 2 } } = ?$$

A) $\sin x$
B) $\cos x$
C) $\sin x + 1$
D) $2 \cos x - 1$