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

यदि `A+B+C=pi` हो तो सिद्ध कीजिए कि -
`(sinA+sinB-sinC)/(sinA+sinB+sinC)="tan"A/2"tan"B/2`.

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