Sin A. Sin (A + B) = COS B-COS (2A+B)
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Dude !, check your LHS. It has to be 2sinA.sin(A + B)
Solving RHS :
= cosB - cos(2A + B)
= cosB - cos2A.cosB + sin2A.sinB
= cosB(1 - cos2A) + sin2A.sinB
= cosB.(2sin²A) + 2sinA.cosA.sinB
= 2sinA(sinA.cosB + cosA.sinB)
= 2sinA.sin(A + B) = LHS
Hope it'll help you.....
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