User:Tefal
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\ln(\frac{\pi}{2})= \int\limits_{0}^{1} \int\limits_{0}^{1} \frac{t^x}{t+1} \diff x \, \, \mathrm{d}t -Etg bastien
\ln(\frac{\pi}{2})= \int\limits_{0}^{1} \int\limits_{0}^{1} \frac{t^x}{t+1} \diff x \, \, \mathrm{d}t -Etg bastien