MCQ
$\int \frac{1}{e^x+1} d x=\ .......... $
- A$\log \left(\frac{e^x}{e^x+1}\right)+c$
- B$\log \left(\frac{e^x+1}{e^x}\right)+c$
- C$\log \left(1+e^x\right)+c$
- D$\log \left(1-e^{-x}\right)+c$
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