The inverse of the function $f(x) = \frac{10^x - 10^{-x}}{10^x + 10^{-x}}$ is

  • A
    $\frac{1}{2} \log_{10} \left( \frac{1+x}{1-x} \right)$
  • B
    $\frac{1}{2} \log_{10} \left( \frac{1-x}{1+x} \right)$
  • C
    $\frac{1}{4} \log_{10} \left( \frac{2x}{2-x} \right)$
  • D
    None of these

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