int (dx)/(1+e^(-x)) is equal to...

`int (dx)/(1+e^(-x)) ` is equal to

A

`1 +e^x +C`

B

`1/2 "log" (1+e^x)+C`

C

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

D

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

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The correct Answer is:

C

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