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

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

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