$\frac{d}{d x}\left(\sqrt{\frac{1-\tan x}{1+\tan x}}\right) = $

  • A
    $\frac{\sec ^2 x}{(1+\tan x)^{3 / 2}(1-\tan x)^{1 / 2}}$
  • B
    $\frac{-\sec ^2 x}{\left(1-\tan ^2 x\right)^{1 / 2}}$
  • C
    $\frac{\sec ^2 x}{\left(1-\tan ^2 x\right)^{1 / 2}}$
  • D
    $\frac{-\sec ^2 x}{(1+\tan x)^{3 / 2}(1-\tan x)^{1 / 2}}$

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