$\int \frac{1+2 e^{-x}}{1-2 e^{-x}} d x=$

  • A
    $x-\log \left|1-2 e^{-x}\right|+c$
  • B
    $x+\log \left|1-2 e^{-x}\right|+c$
  • C
    $x+2\log \left|1-2 e^{-x}\right|+c$
  • D
    $\log \left|1-2 e^{-x}\right|+c$

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