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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The standard of proof used in civil cases, requiring that something is more likely to be true than not for it to be considered proven.

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