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If int(dx)/(1+e^(x))=x+f(x)+C , then f(x...

If `int(dx)/(1+e^(x))=x+f(x)+C` , then f(x) is equal to

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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