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" 21.सिद्ध कीजिए "sin A sin(60^(@)-A)sin...

" 21.सिद्ध कीजिए "sin A sin(60^(@)-A)sin(60^(@)+A)=(1)/(4)sin3A

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Prove that: sin A sin(60^(@)-A)sin(60^(@)+A)=(1)/(4)sin3A

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