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यदि A+B+C=pi हो, तो सिद्ध कीजिए कि : ...

यदि `A+B+C=pi` हो, तो सिद्ध कीजिए कि : `"cos"(A)/(2)+"cos"(B)/(2)+"cos"(C )/(2)=4 cos((pi-A)/(4))cos((pi-B)/(4))cos((pi-C)/(4))`.

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