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in a triangle \mathbf{A B C}, r_{1} \cot \frac{A}{2}+r_{2} \cot \frac{B}{2}

in a triangle \mathbf{A B C}, r_{1} \cot \frac{A}{2}+r_{2} \cot \frac{B}{2}+r_{3} \cot \frac{C}{2}=ABC,r 1 ​ cot 2 A ​ +r 2 ​ cot 2 B ​ +r 3 ​ cot 2 C ​ =

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