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Prove that in DeltaABC, ((a+b+c)^(2))/...

Prove that in `DeltaABC,`
`((a+b+c)^(2))/(a^(2)+ b^(2)+c^(2))implies(cot ""(A)/(2)+cot ""(B)/(2)+cot ""(C)/(2))/(cosA+cot B+ cot C)`

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