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यदि A+B+C=pi हो तो सिद्ध कीजिए कि - "sin...

यदि `A+B+C=pi` हो तो सिद्ध कीजिए कि - `"sin"A/2+"sin"B/2+"sin"C/2=1+4"sin"(pi-A)/(4)"sin"(pi-B)/(4)"sin"(pi-C)/(4)`.

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