જો $u = e^{-x^2 - y^2}$ હોય,તો

  • A
    $x u_x = y u_y$
  • B
    $y u_x = x u_y$
  • C
    $y u_x + x u_y = 0$
  • D
    $x^2 u_y + y^2 u_x = 0$

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