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Verify the Identity $\frac { \cos x + \cos y } { \sin x - \sin y } = \cot \frac { x - y } { 2 }$

Question 139

Essay

Verify the identity.
- $\frac { \cos x + \cos y } { \sin x - \sin y } = \cot \frac { x - y } { 2 }$

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