The integral becomes:
Let \(u = e^x\). Then, \(du = e^x dx\).
Change the limits of integration:
The integral becomes:
Let \(I = \int_{0}^{1}\frac{dx}{e^{x}+e^{-x}}\)
Multiply numerator and denominator by \(e^x\):
\(I = \int_{0}^{1}\frac{e^{x}}{e^{2x}+1}dx\)
Let \(u = e^x\), then \(du = e^x dx\)
When \(x = 0\), \(u = e^0 = 1\)
When \(x = 1\), \(u = e^1 = e\)
So, \(I = \int_{1}^{e}\frac{du}{u^{2}+1}\)
The integral of \(\frac{1}{u^2 + 1}\) is \(\tan^{-1}(u)\)
Therefore, \(I = [\tan^{-1}(u)]_{1}^{e}\)
\(I = \tan^{-1}(e) - \tan^{-1}(1)\)
Since \(\tan^{-1}(1) = \frac{\pi}{4}\)
\(I = \tan^{-1}(e) - \frac{\pi}{4}\)
Correct Answer: \(\tan^{-1}e-\frac{\pi}{4}\)
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