4 COSA×cos60-A×cos60+A=Cos3A4CosA×COS Sq 60 A=Cos3A4CosA×1/2^2=cos3A[Cos 60=1/2]CosA 1=Cos3A0=Cos3A-Cos1A【zero PRODUCT rule】0=Cos2A. Ans
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