If for $x \in \left(0, \frac{1}{4}\right)$,the derivative of $\tan^{-1}\left(\frac{6x\sqrt{x}}{1-9x^3}\right)$ is $\sqrt{x} \cdot g(x)$,then $g(x)$ equals

  • A
    $\frac{3x\sqrt{x}}{1-9x^3}$
  • B
    $\frac{3x}{1-9x^3}$
  • C
    $\frac{3}{1+9x^3}$
  • D
    $\frac{9}{1+9x^3}$

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