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OpenStudy (anonymous):
(cos A + cos b)^2 + (sin A + sin B)^2=?
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OpenStudy (anonymous):
@apoorvk @satellite73 @A.Avinash_Goutham @ajprincess @AndrewNJ
OpenStudy (apoorvk):
okay, expand the two whole-squares, it's simple enough...
OpenStudy (anonymous):
the options are 4cos^2(a-b/2) 4 sin a/2 cos b/2
OpenStudy (anonymous):
|dw:1339426035616:dw|
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