$\int\limits_0^{\frac{\pi }{2}} \frac{dx}{1 + a^2 \sin^2 x}$ का मान ज्ञात कीजिए :

  • A
    $\frac{\pi}{2\sqrt{1 + a^2}}$
  • B
    $\frac{\pi}{\sqrt{1 + a^2}}$
  • C
    $\frac{2\pi}{\sqrt{1 + a^2}}$
  • D
    इनमें से कोई नहीं

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