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int\ (x+1)/(x(1+x \ e^x)^2) \ dx equals...

`int\ (x+1)/(x(1+x \ e^x)^2) \ dx` equals

A

`(1)/(1+xe^(x))+C`

B

`log((xe^(x))/(1+xe^(x)))+C`

C

`(1)/(1+xe^(x))+log((xe^(x))/(1+xe^(x)))+C`

D

`x(e^(x)+1)+C`

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