If ${x^y} \cdot {y^x} = 1$,then ${{dy} \over {dx}} = $

  • A
    $ - {{y(y + x\log x)} \over {x(x + y\log y)}}$
  • B
    $ - {{y(y + x\log y)} \over {x(x + y\log x)}}$
  • C
    $ - {{y(x + y\log x)} \over {x(y + x\log y)}}$
  • D
    None of these

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