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सिद्ध कीजिए कि 2 tan^(-1)""((1)/(2...

सिद्ध कीजिए कि
` 2 tan^(-1)""((1)/(2))=tan^(-1)""(4)/(3)`

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Prove that 2tan^(-1)((1)/(2))=tan^(-1)((4)/(3))

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