Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Complete the identity.
- $$\frac { \sin ( \alpha - \beta ) } { \sin ( \alpha + \beta ) } = ?$$

A) $\frac { \tan \alpha \tan \beta - 1 } { \tan \alpha \tan \beta + 1 }$
B) $\frac { \tan \alpha - \tan \beta } { \tan \alpha + \tan \beta }$
C) $- 1$
D) $\frac { \sin \alpha - \sin \beta } { \sin \alpha + \sin \beta }$