1.

int((x^(2) +1))/(x^(4) + 7x^(2) + 1) dx =

Answer»

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

Answer :A


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