If $x^y = e^{x-y}$,then $\frac{dy}{dx} = $

  • A
    $\frac{\log x}{1+\log x}$
  • B
    $\frac{\log x}{x(1+\log x)^2}$
  • C
    $\frac{\log x}{(1+\log x)^2}$
  • D
    $\frac{x \log x}{(1+\log x)^2}$

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