1.

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

Answer»

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

Answer :B


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