જો $y=\sqrt{\cosh x+\sqrt{\cosh x+\dots}}$,તો $\frac{d y}{d x}=$

  • A
    $\frac{\sinh x}{2y-1}$
  • B
    $\frac{\sinh x}{y(2y^2-1)}$
  • C
    $\frac{\sinh x}{2y^2-1}$
  • D
    $\frac{\sinh x}{y(4y^2-2)}$

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