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Question

sin2(n+1)Asin2(n)=sin(2n+1)A.sinA

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Solution

sin2(n+1)Asin2nA=sin(2n+1)A.sinA
sin2asin2b=sin(ab)sin(a+b)
sin(n+A+nA)sin(nA+AnA)
sin(2n+1)A.sinA

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