If $y = \frac{\tan x + \cot x}{\tan x - \cot x}$,then $\frac{dy}{dx} = $

  • A
    $2\tan 2x \sec 2x$
  • B
    $\tan 2x \sec 2x$
  • C
    $-\tan 2x \sec 2x$
  • D
    $-2\tan 2x \sec 2x$

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