Finding $\int_0^{\infty}xe^{-\lambda_1x} \, dx$ with integration by parts
98710
Finding $\int_0^{\infty}xe^{-\lambda x} \, dx$
39629
Indefinite integration of $\int \frac{1}{1+\sqrt{x^2+2x+2}}dx$
111775
$\int_{-\infty}^{+\infty} e^{-x^2} dx$ with complex analysis
148743
$\int_0^\infty \frac{1}{1+x^ 9} \, dx$
142516
Evaluating the integral, $\int_{0}^{\infty} \ln\left(1 - e^{-x}\right) \,\mathrm dx $
148092
Use integration by parts to prove $ \int^\infty_0 x^ne^{-x} dx=n!$
84765
Evaluating $\int_{-\infty}^{\infty}\frac{1}{(x^2+b^2)^2}dx$
80903
Help with integrating $\int_0^{\infty} \frac{(\log x)^2}{x^2 + 1} \operatorname d\!x$ - contour integration?
57167
A hard problem on exponential integration
21390
How to integrate $\int_0^{\infty} \frac{e^{ax} - e^{bx}}{(1 + e^{ax})(1+ e^{bx})}dx$ where $a,b > 0$.
90095
Integrate $\int_0^{\infty } \frac{\cos x}{x} dx$
84884
Need help with the integral $\int_{0}^\infty e^{-x^{2}}x^{2n+1}dx $
146737
Integrate $\iiint_E z\,dx\,dy\,dz$ in $E=\lbrace(x,y,z) : x^2+y^2+z^2 \leq 4, z \leq 1 \rbrace$
140574
Find $\lim_{n\to \infty} \int_0^1 nx^n e^{x^2} dx$
106812
Find $\int_{0}^{\infty} \frac{\ln(x)}{1+x^2}dx$
93759
Evaluate $\int_{0}^{\infty} \frac{e^{ax}-e^{bx}}{(1+e^{ax})(1+e^{bx})} dx$
109901
Computing $\int_0^\infty\frac1{(x+1)(x+2)\cdots(x+n)}\mathrm dx $