1.

if int((x^(2)-1)dx)/((x^(4)+3x^(2)+1)tan^(-1)""(x^(2)+1)/(x)) = log|tan^(-1)f(x)|+C then

Answer»

`f(x) = x^(2) + 1`
`f(x) = (x^(2) + 1)/(2X)`
`f(x) = (1)/(2) (x^(2) + 1)`
`f(x)= (x^(2) + 1)/(x)`

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