$\int_{a}^{b} \frac{\sqrt{x}}{\sqrt{x} + \sqrt{a + b - x}} dx = . . . . . .$

  • A
    $a + b$
  • B
    $\frac{b - a}{2}$
  • C
    $a - b$
  • D
    $\frac{a - b}{2}$

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