यदि $y=\sqrt{\frac{1+\tan x}{1-\tan x}}$,तो $\frac{d y}{d x}=$

  • A
    $\frac{1}{2}\left(\sqrt{\frac{1-\tan x}{1+\tan x}}\right) \sec ^2\left(\frac{\pi}{4}+x\right)$
  • B
    $\frac{1}{2}\left(\sqrt{\frac{1-\tan x}{1+\tan x}}\right) \sec \left(\frac{\pi}{4}+x\right)$
  • C
    $\left(\sqrt{\frac{1-\tan x}{1+\tan x}}\right) \sec ^2\left(\frac{\pi}{4}+x\right)$
  • D
    $\frac{1}{2}\left(\sqrt{\frac{1+\tan x}{1-\tan x}}\right) \sec ^2\left(\frac{\pi}{4}+x\right)$

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