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सिद्ध कीजिए कि tan^(-1)""1+tan^(-1)2+t...

सिद्ध कीजिए कि
`tan^(-1)""1+tan^(-1)2+tan^(-1)3=pi=2(tan^(-1)1+tan^(-1)""(1)/(2)+tan^(-1)""(1)/(3))`

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