$\int \frac{dx}{(x^2 + 1)(x^2 + 4)} = $

  • A
    $\frac{1}{3}\tan^{-1}x - \frac{1}{3}\tan^{-1}\frac{x}{2} + c$
  • B
    $\frac{1}{3}\tan^{-1}x + \frac{1}{3}\tan^{-1}\frac{x}{2} + c$
  • C
    $\frac{1}{3}\tan^{-1}x - \frac{1}{6}\tan^{-1}\frac{x}{2} + c$
  • D
    $\tan^{-1}x - 2\tan^{-1}\frac{x}{2} + c$

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