$\int \frac{\cos 2 x \cdot \sin 4 x}{\cos ^4 x(1+\cos ^2 2 x)} d x=$

  • A
    $\log \left(\frac{1+\cos 2 x}{1+\cos ^2 2 x}\right)+\sec ^2 x+c$
  • B
    $\log \frac{(1+\cos 2 x)^2}{\left(1+\cos ^2 x\right)}+\sec x+c$
  • C
    $\log \frac{(1+\cos 2 x)^2}{\left(1+\cos ^2 2 x\right)}+\sec ^2 x+c$
  • D
    $\log \frac{1+\cos ^2 2 x}{(1+\cos 2 x)^2}+\sec x+c$

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

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