If $y = x + {1 \over x}$, then

  • A
    ${x^2}{{dy} \over {dx}} + xy = 0$
  • B
    ${x^2}{{dy} \over {dx}} + xy + 2 = 0$
  • C
    ${x^2}{{dy} \over {dx}} - xy + 2 = 0$
  • D
    None of these

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