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The value of ∫01ex1+e2x dx\int_{0}^{1} \frac{e^x}{1+e^{2x}}\,dx is

Solution

✅ Correct Option: 2

Substitute t=ext = e^{x}, so dt=exdxdt = e^{x}dx and limits become 1 to ee. The integral is ∫1edt1+t2=tan⁡−1e−tan⁡−11=tan⁡−1e−π4\int_1^e \frac{dt}{1+t^2} = \tan^{-1}e - \tan^{-1}1 = \tan^{-1}e - \frac{\pi}{4}.

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