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

  • A
    $\log x \cdot [\log (ex)]^{-2}$
  • B
    $\log x \cdot [\log (ex)]^2$
  • C
    $\log x \cdot (\log x)^2$
  • D
    None of these

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