How to evaluate this integral from -infinity to infinity (improper integral)?
119497
How to evaluate the following items in mathematical methods in physics?
10806
Find the value of $\int_{-\infty}^\infty \int_{-\infty}^\infty e^{-(x^2+xy+y^2)} \, dx\,dy$
124445
Integral of the form $\int_{0}^{\infty}e^{-ax}e^{-x^{4}}dx$
90095
Integrate $\int_0^{\infty } \frac{\cos x}{x} dx$
34565
How do I differentiate this integral?
154067
Not sure how to go about solving this integral
84942
What is the integral of 0?
87273
Evaluate the integral $\int_0^{\infty} \lfloor x \rfloor e^{-x}\mathrm dx$
35861
Evaluate $\int_0^\infty\frac{\ln x}{1+x^2}dx$
128572
How $\int_{-\infty}^{\infty}\frac{dx}{1+x^2}$ exists?
85618
Integral of $\frac{x^\alpha}{(1 + x^2)^2}$ from 0 to $\infty$ using contour integration for $-1 < \alpha <3$
51971
How to evaluate the integral $\int e^{x^3}dx $
63650
Evaluating the contour integral $\int_{0}^{\infty}\frac{\sin^{3}(x)}{x^{3}}\mathrm dx$
17115
Please tell me how to evaluate this integral.
68319
How can I evaluate $\int_{-\infty}^{\infty} e^{-x^2} dx$ without using polar coordinates
142516
Evaluating the integral, $\int_{0}^{\infty} \ln\left(1 - e^{-x}\right) \,\mathrm dx $
130668
Evaluating the integral with trigonometric integrand