1.

`(x^(2)+1)/(x^(4)+x^(2(+1)`

Answer» Correct Answer - `(1)/(sqrt3)tan^(-1)((x^(2)-1)/(xsqrt3))`
`int(x^(2)+1)/(x^(4)+x^(2)+1)dx=int(1+(1)/(x^(2)))/([x-(1)/(x)]^(2)+3)dx`
अब माना `x-(1)/(x)=t " "rArr" "1+(1)/(x^(2))dx=dt`


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