$\int_{\pi /4}^{\pi /2} \cos \theta \csc^2 \theta \, d\theta = $

  • A
    $\sqrt{2} - 1$
  • B
    $1 - \sqrt{2}$
  • C
    $\sqrt{2} + 1$
  • D
    આમાંથી કોઈ નહીં

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ધારો કે $\int_\alpha^{\log _e 4} \frac{dx}{\sqrt{e^{x}-1}}=\frac{\pi}{6}$. તો $e^\alpha$ અને $e^{-\alpha}$ એ કયા સમીકરણના બીજ છે:

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