Verify the Identity $$\frac { \sin \alpha - \sin \beta } { \sin \alpha + \sin \beta } = \tan \frac { \alpha - \beta } { 2 } \cot \frac { \alpha + \beta } { 2 }$$

question 53

Essay

Verify the identity.
- $$\frac { \sin \alpha - \sin \beta } { \sin \alpha + \sin \beta } = \tan \frac { \alpha - \beta } { 2 } \cot \frac { \alpha + \beta } { 2 }$$

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