1.

int (x^(2) +1)/(x^(4) + x^(2) + 1)dx =

Answer»

`(1)/(3) tan^(-1) ((x^(2) - 1)/(3X)) + C`
`tan^(-1) ((x^(2) - 1)/(x)) + C`
`(1)/(3) tan^(-1) ((x^(2) - 1)/(x)) + C`
`(1)/(SQRT((3)) tan^(-1) ((x^(2) - 1)/(sqrt(3x))) + C`

Answer :a


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