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Improper Integral

Calculus Level 3

Evaluate the improper integral

\[ \int_0^\infty \frac{1}{e^x + e^{-x}} \, dx.\]

\[\frac{\pi}{4}\] \[\frac{\pi}{e}\] \[\frac{\pi}{2}\] \[\frac{5}{2e}\] \[\frac{e}{2}\]

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by Henry Maltby

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