જો $u=e^{x^2-y^2}$ હોય,તો

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

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