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(cos A + cos b)^2 + (sin A + sin B)^2=?
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@apoorvk @satellite73 @A.Avinash_Goutham @ajprincess @AndrewNJ
okay, expand the two whole-squares, it's simple enough...
the options are 4cos^2(a-b/2) 4 sin a/2 cos b/2
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