1.

If f(x).f((1)/(x))=f(x)+f((1)/(x)), and f(3)=82, then int(f(x))/(x^(2)+1)dx=

Answer»

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

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