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int(1)/(1+e^(x))dx= (a) log(1+e^(x)) ...

`int(1)/(1+e^(x))dx=`
(a) `log(1+e^(x)) `
(b) `log((1+e^(x))/(e^(x)))`
(c) `log(1+e^(-x))`
(d) `-log(e^(-x)+1)`

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