$\frac{d}{dx} \left[ \left( \frac{\tan^2 2x - \tan^2 x}{1 - \tan^2 2x \tan^2 x} \right) \cot 3x \right] =$

  • A
    $\tan 2x \tan x$
  • B
    $\tan 3x \tan x$
  • C
    $\sec^2 x$
  • D
    $\sec x \tan x$

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