Complete the Identity $$\frac { \sin \theta } { 1 + \sin \theta } - \frac { \sin \theta } { 1 - \sin \theta } = ?$$

Multiple Choice

Complete the identity.
- $$\frac { \sin \theta } { 1 + \sin \theta } - \frac { \sin \theta } { 1 - \sin \theta } = ?$$

A) $\sin \theta \tan \theta$
B) $1 + \cot \theta$
C) $\sec \theta \csc \theta$
D) $- 2 \tan ^ { 2 } \theta$