यदि ${x^x}{y^y}{z^z} = c$ है,तो ${{\partial z} \over {\partial x}} = $

  • A
    ${{1 + \log x} \over {1 + \log z}}$
  • B
    $ - {{1 + \log x} \over {1 + \log z}}$
  • C
    $ - {{1 + \log y} \over {1 + \log z}}$
  • D
    इनमें से कोई नहीं

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