જો $\sinh x = \frac{\sqrt{21}}{2}$ હોય,તો $\cosh 2x + \sinh 2x = $

  • A
    $\frac{21}{2}$
  • B
    $\frac{25}{2}$
  • C
    $\frac{23 + 5\sqrt{21}}{2}$
  • D
    $\frac{32 + 5\sqrt{23}}{2}$

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