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यदि A+B+C=pi हो तो सिद्ध कीजिए कि - (1...

यदि `A+B+C=pi` हो तो सिद्ध कीजिए कि -
`(1+cosA-cosB+cosC)/(1+cosA+cosB-cosC)="tan"B/2"cot"C/2`.

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