If $ x^{y}=e^{x-y} $ then $ \frac{d y}{d x} $ is equal to

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

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