Consider the function $y = \log_{a}(x + \sqrt{x^{2} + 1})$ where $a > 0$ and $a \neq 1$. The inverse of the function:

  • A
    does not exist
  • B
    is $x = \log_{1/a}(y + \sqrt{y^{2} + 1})$
  • C
    is $x = \sinh(y \log a)$
  • D
    is $x = \cosh(-y \log \frac{1}{a})$

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