1.

int(x^(2))/((x^(2)+a^(2))(x^(2)+b^(2)))dx

Answer»

`(1)/((a^(2)-b^(2)))[(1)/(b)tan^(-1)((x)/(b))-(1)/(a)"tan"^(-1)((x)/(a))]+C`
`(1)/((b^(2)-a^(2)))[(1)/(b)tan^(-1)((x)/(b))-(1)/(a)"tan"^(-1)((x)/(a))]+c`
`(1)/(b)tan^(-1) ((x)/(b))-(1)/(a)tan^(-1)((x)/(a))+c`
`(1)/(a)tan^(-1) ((x)/(b))-(1)/(a)tan^(-1)((x)/(a))+c`

ANSWER :A


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