1.

int ((x^2+1))/(x^2+7x^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)/(x))+c`

Answer :A


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