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int e^(tan^(-1)x) ((1+x+x^2)/(1+x^2))dx...

`int e^(tan^(-1)x) ((1+x+x^2)/(1+x^2))dx`

A

`xe^(tan^(-1)x)+C`

B

`x^(2)e^(tan^(-1)x)+C`

C

`(1)/(x)e^(tan^(-1)x)+C`

D

`((1+x^(2)))/(2)e^(tan^(-1)x)+C`

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