$\int \frac{13 \cos 2 x-9 \sin 2 x}{3 \cos 2 x-4 \sin 2 x} d x=$

  • A
    $3 x-\frac{1}{2} \log |3 \cos 2 x-4 \sin 2 x|+c$
  • B
    $\frac{x}{2}-3 \log |3 \cos 2 x-4 \sin 2 x|+c$
  • C
    $3 x+\frac{1}{2} \log |3 \cos 2 x-4 \sin 2 x|+c$
  • D
    $x+\frac{3}{2} \log |3 \cos 2 x-4 \sin 2 x|+c$

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Difficult
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$\int \left[ \log(\log x) + \frac{1}{(\log x)^2} \right] dx = $

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