$\mathop {\lim }\limits_{x \to a} \frac{{\sqrt {3x - a} - \sqrt {x + a} }}{{x - a}} = $

  • A
    $\sqrt{2a}$
  • B
    $1/\sqrt{2a}$
  • C
    $2a$
  • D
    $1/2a$

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