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

  • A
    $\frac{1}{2} \sqrt{1 + x} + c$
  • B
    $\frac{2}{3} (1 + x)^{3/2} + c$
  • C
    $\sqrt{1 + x} + c$
  • D
    $2 (1 + x)^{3/2} + c$

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