જો $\frac{x}{x-y} = \log \left(\frac{a}{x-y}\right)$ હોય,તો $\frac{dy}{dx} =$

  • A
    $2 + \frac{1}{y}$
  • B
    $\frac{2y - x}{y}$
  • C
    $\frac{2x - y}{x}$
  • D
    $\frac{x - 2y}{y}$

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