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The differential equation of $y = k _1+\frac{k_2}{x}$ is

• A
  $\frac{d^2 y}{d x^2}+2 \frac{d y}{d x}=0$
• ✓
  $x \frac{d^2 y}{d x^2}+2 \frac{d y}{d x}=0$
• C
  $\frac{d^2 y}{d x^2}-2 \frac{d y}{d x}=0$
• D
  $x \frac{d^2 y}{d x^2}-2 \frac{d y}{d x}=0$