Editor
$\int \frac{dx}{e^{x}+1}$ equals:
Difficulty: Easy
A: 
$ln|e^{x}+1|$
B: 
$x-ln(1+e^{x})$
C: 
$\tan^{-1}(e^{x}+1)$
D: 
$-\frac{1}{e^{x}+1}$
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