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If A+B+C= pi and (sin 2 A + sin 2B + sin...

If `A+B+C= pi and (sin 2 A + sin 2B + sin 2 C)/(sin A + sin B + sin C ) = lamda sin ((A)/(2)) sin ((B)/(2)) sin ((C )/(2)) ,` then the value of `lamda ` must be

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