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Verify the Identity cos⁡(α−β)−cos⁡(α+β)=2sin⁡αsin⁡β\cos ( \alpha - \beta ) - \cos ( \alpha + \beta ) = 2 \sin \alpha \sin \beta

Question 138

Essay

Verify the identity.
- cos⁡(α−β)−cos⁡(α+β)=2sin⁡αsin⁡β\cos ( \alpha - \beta ) - \cos ( \alpha + \beta ) = 2 \sin \alpha \sin \beta

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