$1 + \frac{3}{1!} + \frac{5}{2!} + \frac{7}{3!} + ....\infty = $

  • A
    $e$
  • B
    $2e$
  • C
    $3e$
  • D
    $4e$

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If $2 \sinh x = \cosh x$,then $x =$

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