Proove suna+sin(120+A) -sin(120-A) =0
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LHS= SinA + sinAcos120+cosAsin120+sinAcos120-cosAsin120 ( cosAsin120 cancels)
= sinA + 2sinAcos120 (cos120=-1/2). ( 120-180=-60=Implies -cos60)
= sinA + 2sinA -1/2. ( 2 cancels),
= SinA -SinA =0=Rhs ( proven). Or (qed)
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