$\int \frac{1}{(x-2)(x^2+1)} dx=$

  • A
    $\log \frac{\sqrt{x^2+1}}{|x-2|}+2 \tan ^{-1} x+c$
  • B
    $\log \frac{|x-2|}{x^2+1}+2 \tan ^{-1} x+c$
  • C
    $\frac{1}{5}\left[\log \frac{|x-2|}{\sqrt{x^2+1}}+2 \tan ^{-1} x\right]+c$
  • D
    $\frac{1}{5}\left[\log \frac{|x-2|}{\sqrt{1+x^2}}-2 \tan ^{-1} x\right]+c$

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$\int \frac{3x+4}{x^3-2x-4} dx = \log f(x) + C \Rightarrow f(3) = ?$

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