If 2cos theta=root 3 then proe that 3 sin theta -4sin^3 theta
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2 cosA=root 3
CosA=root then A=30
3 sinA-4sinv3A=sin3A=sin 90 =1
CosA=root then A=30
3 sinA-4sinv3A=sin3A=sin 90 =1
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