sin(60+ a)+ sin(60-a)=1/4(3-4 sin^2a)
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I guess you are asking for a proof
so here it is
simplify the lhs using sin a + b = sin a cos b +sin b cos A and Sin A -b = sin a cos b -Sin B cos A then simplify the sin 2a in the RHS Voila you will arrive to your answer
so here it is
simplify the lhs using sin a + b = sin a cos b +sin b cos A and Sin A -b = sin a cos b -Sin B cos A then simplify the sin 2a in the RHS Voila you will arrive to your answer
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