$\mathop {Limit}\limits_{x \to 0^+} \frac{1}{x\sqrt{x}} \left( a \tan^{-1} \frac{\sqrt{x}}{a} - b \tan^{-1} \frac{\sqrt{x}}{b} \right)$ का मान किसके बराबर है?

  • A
    $\frac{a - b}{3}$
  • B
    $0$
  • C
    $\frac{a^2 - b^2}{6a^2b^2}$
  • D
    $\frac{a^2 - b^2}{3a^2b^2}$

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