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फलनों का समाकलन कीजिए - `(1)/(1+x+x^(2)+x^(3))`

Answer» Correct Answer - `(1)/(2)log(1+x)-(1)/(4)log(1+x^(2))+(1)/(2)tan^(-1)x`
`(1)/(1+x+x^(2)+x^(3))=(1)/(2(1+x))-(x)/(2(1+x^(2)))+(2)/(2(1+x^(2)))`


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