समाकलन $\int_{-\pi / 2}^{\pi / 2} \frac{\sin^2 x}{1+e^x} \, dx$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{2}$
  • D
    $\frac{\pi^2}{2}$

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निश्चित समाकल $\int_0^{2a} f(x) dx$ का मान ज्ञात कीजिए।

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