The result is simple,
Since how to derive this is not so difficult, I do not give that here. You can easily confirm the formula by numerical calculations. If you could not derive this, please e-mail me (email@example.com). Then I will show you how to do. Or the report in which you have succeeded it would also be welcome. I really would like to hear anythings related to my pages from anybody. My derivation gives you a few lines to derive it. Some people may notice the origin of this integral's story.