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Convergence et calcul de : \[\int_{0}^{\infty }\frac{dx}{1+\cosh ^{2}x}, \ \int_{1}^{\infty }\frac{dx}{\sinh x}, \ \int_{-\infty }^{\infty }\frac{dt}{\cosh t}.\]
Convergence et calcul de : \[\int_{0}^{\infty }\frac{dx}{1+\cosh ^{2}x}, \ \int_{1}^{\infty }\frac{dx}{\sinh x}, \ \int_{-\infty }^{\infty }\frac{dt}{\cosh t}.\]