જો $\sinh x = -\frac{4}{3}$ હોય,તો $\sinh 2x + \cosh 2x = $

  • A
    $\frac{-31}{41}$
  • B
    $\frac{-20}{9}$
  • C
    $\frac{49}{41}$
  • D
    $9$

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