Forgot password?
 Create new account
View 163|Reply 1

定积分(0,∞) arctan^3(x)/x^(3/2)

[Copy link]

3151

Threads

8498

Posts

610K

Credits

Credits
66208
QQ

Show all posts

hbghlyj Posted at 2023-3-31 03:10:18 |Read mode
$$\int_0^\infty \frac{\arctan^3 x}{x\sqrt{x}}\rmd x=\frac{5\sqrt{2}\pi^3}{16}-\frac{3\sqrt{2}\pi^2\log 2}{4}-\frac{3\sqrt{2}\pi \log^2 2}{8}$$
来自chaoli.club 积分爱好者,但其实是物理人

WolframAlpha只能算出数值
Untitled.gif
integral-calculator也只能算出数值

3151

Threads

8498

Posts

610K

Credits

Credits
66208
QQ

Show all posts

 Author| hbghlyj Posted at 2023-3-31 03:14:31
$\arctan(z)=\frac12 i \log(1 - i z) - \frac12 i \log(1 + i z)$
然后使用留数定理

手机版Mobile version|Leisure Math Forum

2025-4-21 14:30 GMT+8

Powered by Discuz!

× Quick Reply To Top Return to the list