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" Prove that "cot A+cot B+cot C=(a^(2)+b...

" Prove that "cot A+cot B+cot C=(a^(2)+b^(2)+c^(2))/(4Delta)

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With usual notations,prove that in a triangle ABC cot A+cot B+cot C=(a^(2)+b^(2)+c^(2))/(4Delta)

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