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Delta ABC में सिद्ध कीजिए कि - (cot...

` Delta ABC` में सिद्ध कीजिए कि -
` (cot.A/2 + cot.B/2+cot.C/2)/(cotA +cotB +cotC)=((a+b+c)^(2))/(a^(2)+b^(2)+c^(2))`

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