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Verify the Given Identity cos⁡u−cos⁡vcos⁡u+cos⁡v=−tan⁡12(u+v)tan⁡12(u−v)\frac { \cos u - \cos v } { \cos u + \cos v } = - \tan \frac { 1 } { 2 } ( u + v ) \tan \frac { 1 } { 2 } ( u - v )

Question 37

Essay

Verify the given identity.
cos⁡u−cos⁡vcos⁡u+cos⁡v=−tan⁡12(u+v)tan⁡12(u−v)\frac { \cos u - \cos v } { \cos u + \cos v } = - \tan \frac { 1 } { 2 } ( u + v ) \tan \frac { 1 } { 2 } ( u - v )

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