यदि $x = \log \left( y + \sqrt{y^2 + 1} \right)$ है, तो $y =$

  • A
    $\tanh x$
  • B
    $\coth x$
  • C
    $\sinh x$
  • D
    $\cosh x$

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$\log (\cosh 3 + \sinh 3) + \log (\cosh 3 - \sinh 3) = $

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