Efficiently evaluating $\int x^{4}e^{-x}dx$
121403
How to integrate $ \int x^n e^x dx$?
115375
Indefinite integral of $e^{x^n}$
87273
Evaluate the integral $\int_0^{\infty} \lfloor x \rfloor e^{-x}\mathrm dx$
130935
Evaluating $\int_{0}^{1}\frac{x-1}{(x+1)\ln x} dx $
84826
Evaluating $\int_0^{2 \pi} e^{\cos x} \cos (nx - \sin x) \,dx$ using complex analysis
92637
Evaluating $\int \frac{\operatorname dx}{x\log x}$
87395
Evaluating $\int_{I^n} \left( \min_{1\le i \le n}x_i \right)^{\alpha}\,\, dx$
58909
Evaluation of $\int\frac{dx}{x+ \sqrt{x^2-x+1}}$
38949
How to Evaluate $\int e^{2x}\sin(3x)\ dx$?
66304
How to evaluate these integrals by hand
8705
Evaluation of $\sum_{x=0}^\infty e^{-x^2}$
111775
$\int_{-\infty}^{+\infty} e^{-x^2} dx$ with complex analysis
63988
General formula for evaluating integrals of the form $\displaystyle\int_0^\infty x^ae^{-bx}dx$
137549
Given $\int_0^{\infty}e^{-x^2}dx = \frac{\sqrt{\pi}}{2}$, evaluate $\int_0^{\infty}e^{-a^2x^2-\frac{b^2}{x^2}}dx $
69978
Evaluating $\int_1^\infty \frac{1}{x(x^2+1)}\ dx$
67655
Simpler way to compute a definite integral without resorting to partial fractions?
82311
Computing the primitive $\int\frac{1}{1+x^n} dx$