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

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

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