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यदि A +B +C =180^(@) तो सिध्द कीजिये कि...

यदि `A +B +C =180^(@)` तो सिध्द कीजिये कि :
`tan A + tan B + tan C = tan A tan B tan C`
अतः सिध्द कीजिये कि :
`cot B cot C+ cot C cot A + cot A cot B =1`

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