$\int_0^a \frac{x \, dx}{\sqrt{a^2 + x^2}} = $

  • A
    $a(\sqrt{2} - 1)$
  • B
    $a(1 - \sqrt{2})$
  • C
    $a(1 + \sqrt{2})$
  • D
    $2a\sqrt{3}$

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