1.

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

Answer»

`LOG(1+e^(X))-x-e^(-x)+C`
`log(1+e^(x))+x-e^(-x)+c`
`log(1+e^(x))-x+e^(-x)+c`
`log(1+e^(x))+x+e^(-x)+c`

ANSWER :A


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