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सिद्ध कीजिए कि - 2(tan^(-1).(1)/(4)+ta...

सिद्ध कीजिए कि -
`2(tan^(-1).(1)/(4)+tan^(-1).(2)/(9))=tan^(-1).(4)/(3)`.

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tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=tan^(-1)(1)/(2)

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