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

  • A
    $2 \log_e(1+e^x) + x + c$
  • B
    $2 \log_e(1+e^x) - x + c$
  • C
    $\log_e(1+e^x) + x + c$
  • D
    $\log_e(1+e^x) - x + c$

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