$x = \log \left( \frac{1}{y} + \sqrt{1 + \frac{1}{y^2}} \right) \Rightarrow y$ is equal to

  • A
    $\tanh x$
  • B
    $\operatorname{coth} x$
  • C
    $\operatorname{sech} x$
  • D
    $\operatorname{cosech} x$

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