$\int \frac{\sin ^8 x-\cos ^8 x}{1-2 \sin ^2 x \cos ^2 x} d x=$

  • A
    $\frac{1}{2} \cos 2 x+c$
  • B
    $\frac{-1}{2} \cos 2 x+c$
  • C
    $\frac{-1}{(1+\tan x)^2}+c$
  • D
    $\frac{-1}{2} \sin 2 x+c$

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