$\frac{d}{dx} \left( \tan^{-1} \left( \frac{x}{1+6x^2} \right) \right) = $ . . . . . .

  • A
    $\frac{3}{1+9x^2} + \frac{2}{1+4x^2}$
  • B
    $\frac{1}{1+9x^2} - \frac{1}{1+4x^2}$
  • C
    $\frac{3}{1+9x^2} - \frac{2}{1+4x^2}$
  • D
    $\frac{(1+6x^2)^2}{1+7x^2}$

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