यदि A + B+C = 180^(@) हो तो सिध्द कीजि...

यदि `A + B+C = 180^(@)` हो तो सिध्द कीजिए कि:
`tan.(A)/(2) tan.(B)/(2)+ tan.(B)/(2) tan. (C)/(2)+ tan.(C)/(2) tan.(A)/(2)=1`

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