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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) = ( a+b+c)/(a+b-c)cot. (C )/(2)`

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