Ask Me Help Desk - Use trigonometric identities to verify

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use trigonometric identities to verify

cos(u+v)cos(u-v)=cos^2u-sin^2v

Use the identities:

$\cos(A+B) = \cos A\cos B - \sin A\sin B$

$\cos(A-B) = \cos A\cos B + \sin A\sin B$

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