\[ \int \frac{1}{1+e^{-x}} d x= \] \( \mathrm{P} \) (1) \( \ln \lef...
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\[
\int \frac{1}{1+e^{-x}} d x=
\]
\( \mathrm{P} \)
(1) \( \ln \left(e^{r}+1\right)+C \)
(2) \( \ln \left(e^{x}-1\right)+C \)
(3) \( \ln \left(e^{-x}+1\right)+C \)
(4) None of these
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