If $x = \log \left( y + \sqrt{y^2 + 1} \right)$,then $y =$
- A$\tanh x$
- B$\coth x$
- C$\sinh x$
- D$\cosh x$
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Difficult
View SolutionIf $\log _{e}\left(x^{2}-16\right) \leq \log _{e}(4 x-11)$,then
$\log (\cosh 3 + \sinh 3) + \log (\cosh 3 - \sinh 3) = $
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