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

  • A
    $2 \cos 2x$
  • B
    $\sin 2x$
  • C
    $\cos 2x$
  • D
    $2 \sin 2x$

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