निश्चित समाकल $\int\limits_{\infty}^{0} \frac{z e^{-z}}{\sqrt{1-e^{-2z}}} \, dz$ का मान ज्ञात कीजिए।

  • A
    $-\frac{\pi}{2} \ln 2$
  • B
    $\frac{\pi}{2} \ln 2$
  • C
    $-\pi \ln 2$
  • D
    $\pi \ln 2$

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$\int_0^\pi \frac{1}{4+3 \cos x} d x=$

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

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