$\int_0^1 \frac{e^{-x}}{1 + e^{-x}} \,dx = $

  • A
    $\log \left( \frac{1 + e}{e} \right) - \frac{1}{e} + 1$
  • B
    $\log \left( \frac{1 + e}{2e} \right) - \frac{1}{e} + 1$
  • C
    $\log \left( \frac{1 + e}{2e} \right) + \frac{1}{e} - 1$
  • D
    આમાંથી કોઈ નહીં

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વિધેય $f(x) = \int\limits_0^x \frac{dt}{\sqrt{x^2 + t^2}}$ નો વ્યાખ્યાનો પ્રદેશ શોધો.

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