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If A+B+C=pi Prove that cot (A/2) + cot (...

If `A+B+C=pi` Prove that `cot (A/2) + cot (B/2) + cot (C/2) = Cot (A/2) Cot (B/2 )Cot (C/2)`

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r^(2) cot ""(A)/(2) cot ""(B)/(2) cot ""(C)/(2)