Integrating $x^2e^{-x}$ using Feynman's trick?
126962
Differentiation under integral sign (Gamma function)
126576
Most efficient way to integrate $\int_0^\pi \sqrt{4\sin^2 x - 4\sin x + 1}\,dx$?
105494
Gaussian-like integral : $\int_0^{\infty} e^{-x^2} \cos( a x) \ \mathrm{d}x$
86794
Integrate $\int \frac{25 - x^2}{x^4} \operatorname d\!x$
7835
Tricky elementary integral $\int_{0}^{\frac{\pi}{2}}x\cot(x)dx$.
67608
Integration of $1/(x^2+x\sqrt{x})$
140638
Integrating $\int_0^{\infty} \frac{dx}{1+x^3}$ using residues.
157364
$\int_{-2}^{2} \sin(x^5)e^{(x^8\sin(x^4))} dx$
62840
Seemingly Simple Integral $\int_0^1\frac{x^2\ln x}{\sqrt{1-x^2}}dx$.
130670
Solving Integrals
42778
Why is the contribution of a path in Feynmans path integral formalism $\sim e^{(i/\hbar)S[x(t)]}$?
89028
Evaluate the integral $\int e^{-x}x^n dx$
75562
How to integrate $\int x^2 \sin^2(x)dx$
8934
How do I solve this improper integral: $\int_{-\infty}^\infty e^{-x^2-x}dx$?
110343
Integrating $\rm x^ae^{-bx}$.
105260
How to integrate $\int\sqrt{x^2+1}dx$
24589
Integral of $1/(x^2-1)^2$