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Verify the Identity cos⁡(α+β)cos⁡αsin⁡β=cot⁡β−tan⁡α\frac { \cos ( \alpha + \beta ) } { \cos \alpha \sin \beta } = \cot \beta - \tan \alpha

Question 216

Essay

Verify the identity.
- cos⁡(α+β)cos⁡αsin⁡β=cot⁡β−tan⁡α\frac { \cos ( \alpha + \beta ) } { \cos \alpha \sin \beta } = \cot \beta - \tan \alpha

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