$\int \frac{1}{e^x+1} dx = $ . . . . . . $+ C$.

  • A
    $\log \left|\frac{e^x}{e^x+1}\right|$
  • B
    $\log \left|\frac{e^x+1}{e^x}\right|$
  • C
    $\log \left|\frac{1}{e^x+1}\right|$
  • D
    $\log \left|\frac{e^x-1}{e^x+1}\right|$

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