$\int \frac{2 \cos 2 x}{(1+\sin 2 x)(1+\cos 2 x)} d x=$

  • A
    $2 \tan x+\log (1+\tan x)+c$
  • B
    $\tan x-2 \log (1+\tan x)+c$
  • C
    $2 \log (1+\tan x)+\tan x+c$
  • D
    $2 \log (1+\tan x)-\tan x+c$

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