જો $\cosh 2x = 199$ હોય,તો $\operatorname{coth} x =$

  • A
    $\frac{5}{3 \sqrt{11}}$
  • B
    $\frac{5}{6 \sqrt{11}}$
  • C
    $\frac{7}{3 \sqrt{11}}$
  • D
    $\frac{10}{3 \sqrt{11}}$

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