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" (ii) "(b-c)cot(A)/(2)+(c-a)cot(B)/(2)+...

" (ii) "(b-c)cot(A)/(2)+(c-a)cot(B)/(2)+(a-b)cot(C)/(2)=0.quad " 40."

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In any triangle ABC, prove that: (b-c)cot(A)/(2)+(c-a)cot(B)/(2)+(a-b)cot(C)/(2)=0

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