The combined equation of the lines passing through the origin and having slopes $\frac{2}{3}$ and $-\frac{2}{3}$ is

  • A
    $2 x^2-9 y^2=0$
  • B
    $4 x^2-x y-9 y^2=0$
  • C
    $4 x^2-9 y^2=0$
  • D
    $4 x^2+x y-9 y^2=0$

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