$\int \frac{dx}{x^2 \sqrt{4+x^2}}$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{4} \sqrt{4+x^2}+C$
  • B
    $\frac{-1}{4} \sqrt{4+x^2}+C$
  • C
    $\frac{-1}{4x} \sqrt{4+x^2}+C$
  • D
    $\frac{9}{4x} \sqrt{4+x^2}+C$

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