$\int_{0}^{1} \frac{dx}{x + \sqrt{1 - x^2}}$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{\pi}{4}$

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माना $A = \int\limits_0^1 \frac{e^t}{1 + t} \, dt$. तो $\int\limits_{a - 1}^a \frac{e^{-t}}{t - a - 1} \, dt$ का मान ज्ञात कीजिए:

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