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In any triangle ABC, prove that, (b-c)co...

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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(xii) (b+c-a)(cot 'B/2' + cot 'C/2') = 2a cot 'A/2