Integral $ \int_0^\infty \int_0^\infty \frac{e^{-(x+y)}}{x + y}\,dx\,dy $
89602
$ \int_{0}^{ \infty} \int_{0}^{ \infty} \frac { e^{-(x+y)}}{x+y} dx dy $
141892
How to evaluate $\int_0^\infty \frac{1}{x^n+1} dx$
140638
Integrating $\int_0^{\infty} \frac{dx}{1+x^3}$ using residues.
1744
Quadruple Integral $\int\limits_0^1\!\!\int\limits_0^1\!\!\int\limits_0^1\!\!\int\limits_0^1\frac1{1-xyzw}\,dw\,dz\,dy\,dx$
81831
Evaluate $\int_0^{\infty}\frac{\log x}{1+e^x}\,dx$
21375
The integral $\int_0^\infty \dfrac{x \sin(x)}{x^2+1} dx$
122843
Finding $\int_0^\infty \frac{\cos(ax)-\cos(bx)}{x}dx$
128572
How $\int_{-\infty}^{\infty}\frac{dx}{1+x^2}$ exists?
91196
Complex Integration of $\int_0^\infty e^{-ax}\cos(bx)\,dx$
123694
How to compute the integral $\int_{0}^{\infty} \frac{x^{1/3}}{1+x^{2}} \ dx$
102399
Computing $ \int_0^\infty \frac{\log x}{\exp x} \ dx $
59667
Evaluating $\int_0^\infty\frac{\sin(x)}{x^2+1}\, dx$
115509
Integral $\int\frac{dy}{(y^2 + ay + b)^{3/2}}$
8829
How to prove $\int_{-\infty}^{+\infty} f(x)dx = \int_{-\infty}^{+\infty} f\left(x - \frac{1}{x}\right)dx?$
124463
Integral from $0$ to $\infty$ of $\ln(x)/e^x$
63956
Evaluate $\int_0^{\infty}\frac{\ln x}{x^a(x+1)}dx$ where $0<a<1$
100194
Calculating $ \int _{0} ^{\infty} \frac{x^{3}}{e^{x}-1}\;dx$