यदि $u(x,y) = y \log x + x \log y$ है,तो ${u_x}{u_y} - {u_x} \log x - {u_y} \log y + \log x \log y = $

  • A
    $0$
  • B
    $-1$
  • C
    $1$
  • D
    $2$

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