Where can I find good integral problems to practice?

[coki2000]

Hello,
I want to solve the best integral problems but i can't find more.If you know some sites,please give me their links. Thank.

 

[n1person]

I don't know what you mean by "best"
If you mean difficult, here is a nice collection of some.
http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1028263#1028263