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Establish the Identity cos⁡(x−y)−cos⁡(x+y)=2sin⁡xsin⁡y\cos ( x - y ) - \cos ( x + y ) = 2 \sin x \sin y

Question 279

Essay

Establish the identity.
- cos⁡(x−y)−cos⁡(x+y)=2sin⁡xsin⁡y\cos ( x - y ) - \cos ( x + y ) = 2 \sin x \sin y

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