$\int \frac{d x}{\cos x \sqrt{\cos 2 x}} = $

  • A
    $\sin ^{-1}(\tan x)+c$
  • B
    $\frac{1}{2} \log \left|\tan \left(\frac{\pi}{4}+x\right)\right|+c$
  • C
    $2 \log \left|\frac{1+\tan x}{1-\tan x}\right|+c$
  • D
    $\frac{1}{2} \log \left|\frac{1-\tan x}{1+\tan x}\right|+c$

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