$\int \frac{(3 x-2) \tan \left(\sqrt{9 x^2-12 x+1}\right)}{\sqrt{9 x^2-12 x+1}} d x=$

  • A
    $\frac{1}{3} \sec ^2 \sqrt{9 x^2-12 x+1}+c$
  • B
    $\frac{1}{3} \sec ^2 x+c$
  • C
    $\frac{1}{2} \log \left|\sec \sqrt{9 x^2-12 x+1}\right|+c$
  • D
    $\frac{1}{3} \log \left|\sec \sqrt{9 x^2-12 x+1}\right|+c$

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