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

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

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Difficult
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$I_n = \int \frac{t^n}{1+t^2} dt, (n = 1, 2, 3, \ldots) \Rightarrow I_6 + I_4 =$

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