જો $\sinh x = -\frac{1}{2}$ હોય,તો $\tanh 2x = $

  • A
    $-\frac{\sqrt{5}}{2}$
  • B
    $-\sqrt{3}$
  • C
    $-\frac{\sqrt{5}}{3}$
  • D
    $-\frac{\sqrt{3}}{2}$

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