In a triangle ABC, prove that (cot(A/...

In a triangle ABC, prove that `(cot(A/2)+cot(B/2)+cot(C/2))/(cotA+cotB+cot(C))=((a+b+c)^2)/(a^2+b^2+c^2)`

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The correct Answer is:

`(cot A//2+cot B//2+cot C//2)/(cot A + cot B+cot C)=>((a+b+c)^(2))/((a^(2)+b^(2)+c^(2)))`

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