$\int_0^{x} \frac{t^2}{\sqrt{a^2+t^2}} dt =$

  • A
    $\frac{x}{2} \sqrt{a^2+x^2} + \log \left|x+\sqrt{a^2+x^2}\right|$
  • B
    $\sqrt{a^2+x^2} - a^2 \operatorname{Sinh}^{-1} \frac{x}{a}$
  • C
    $\frac{x}{2} \sqrt{a^2+x^2} + \frac{a^2}{4} \log \left|x+\sqrt{a^2+x^2}\right|$
  • D
    $\frac{x}{2} \sqrt{a^2+x^2} - \frac{a^2}{2} \log \left| \frac{x+\sqrt{a^2+x^2}}{a} \right|$

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