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यदि A+B+C=2S , तो सिद्ध कीजिए कि - ...

यदि ` A+B+C=2S` , तो सिद्ध कीजिए कि -
` sin (S-A) + sin (S-B) + sin (S - C) - sin S`
` = 4sin . A/2 sin.B/2 sin.C/2 `

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