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

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

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