If $\cosh 2x = 241$,then $\operatorname{coth} x$ is equal to

  • A
    $\frac{7}{\sqrt{30}}$
  • B
    $\frac{11}{\sqrt{30}}$
  • C
    $\frac{7}{2 \sqrt{30}}$
  • D
    $\frac{11}{2 \sqrt{30}}$

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