यदि $\operatorname{cosech} x = \frac{4}{5}$ है,तो $\cosh x =$

  • A
    $\sqrt{\frac{41}{21}}$
  • B
    $\sqrt{\frac{41}{19}}$
  • C
    $\sqrt{\frac{41}{25}}$
  • D
    $\sqrt{\frac{41}{16}}$

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