$\int \frac{\left(x+\sqrt{1+x^2}\right)^2}{\sqrt{1+x^2}} d x=$

  • A
    $\frac{x}{\sqrt{1+x^2}}+C$
  • B
    $\log \left|x+\sqrt{1+x^2}\right|+C$
  • C
    $x+\sqrt{1+x^2}+C$
  • D
    $\frac{\left(x+\sqrt{1+x^2}\right)^2}{2}+C$

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