The inverse of the function $f(x) = \frac{e^x - e^{-x}}{e^x + e^{-x}} + 2$ is given by

  • A
    $\log_e \left( \frac{x - 2}{x - 1} \right)^{1/2}$
  • B
    $\log_e \left( \frac{x - 1}{3 - x} \right)^{1/2}$
  • C
    $\log_e \left( \frac{x}{2 - x} \right)^{1/2}$
  • D
    $\log_e \left( \frac{x - 1}{x + 1} \right)^{-2}$

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