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Prove sin⁡(x+y)+sin⁡(x−y)=2sin⁡xcos⁡y\sin ( x + y ) + \sin ( x - y ) = 2 \sin x \cos y

Question 33

Essay

Prove sin⁡(x+y)+sin⁡(x−y)=2sin⁡xcos⁡y\sin ( x + y ) + \sin ( x - y ) = 2 \sin x \cos y .

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