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Verify the Given Identity cos⁡(x+y)cos⁡(x−y)=cos⁡2x−sin⁡2y\cos ( x + y ) \cos ( x - y ) = \cos ^ { 2 } x - \sin ^ { 2 } y

Question 68

Essay

Verify the given identity.
cos⁡(x+y)cos⁡(x−y)=cos⁡2x−sin⁡2y\cos ( x + y ) \cos ( x - y ) = \cos ^ { 2 } x - \sin ^ { 2 } y

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\[\begin{aligned}
\cos ( x + y ) \cos ( ...

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