If $l = \lim_{\theta \rightarrow 0} \left( \frac{3 \sin \theta - 4 \sin^3 \theta}{\theta} \right)$ and $m = \lim_{\theta \rightarrow 0} \left( \frac{2 \tan \theta}{\theta(1 - \tan^2 \theta)} \right)$,find the quadratic equation whose roots are $l$ and $m$.

  • A
    $x^2 + 5x + 6 = 0$
  • B
    $x^2 - 5x + 6 = 0$
  • C
    $x^2 - 5x - 6 = 0$
  • D
    $x^2 + 5x - 6 = 0$

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