$\int \frac{dx}{1 + x + x^2 + x^3} = $

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

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$\int \frac{dx}{\sin x + \sin 2x} = $

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