मान लीजिए $I = \int_{\pi / 4}^{\pi / 3} \frac{\sin x}{x} dx$. तो

  • A
    $\frac{\sqrt{3}}{8} \leq I \leq \frac{\sqrt{2}}{6}$
  • B
    $\frac{\sqrt{3}}{2 \pi} \leq I \leq \frac{2 \sqrt{3}}{\pi}$
  • C
    $\frac{\sqrt{3}}{9} \leq I \leq \frac{\sqrt{2}}{16}$
  • D
    $\pi \leq I \leq \frac{4 \pi}{3}$

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$\int_{-5}^{5} \left[ \frac{e^{x} + e^{-x}}{e^{x} - e^{-x}} \right] dx = $

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