फलन $f(x) = \int\limits_0^x \frac{dt}{\sqrt{x^2 + t^2}}$ का प्रांत (domain) क्या है?

  • A
    $R$
  • B
    $R^+$
  • C
    $R^+ \cup \{0\}$
  • D
    $R - \{0\}$

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