$\int \frac{1}{\left(1+x^2\right) \sqrt{x^2+2}} d x=$

  • A
    $-\tan ^{-1} \frac{\sqrt{x^2+2}}{|x|}+c$
  • B
    $-\tan ^{-1} \sqrt{x^2+2}+c$
  • C
    $\tan ^{-1} \sqrt{\frac{x^2+1}{x^2+2}}+c$
  • D
    $-\tan ^{-1} \sqrt{\frac{x^2+2}{x^2+1}}+c$

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