Integral (極難之 7, 有興趣挑戰請進)

可用convergent infinite fn. series表示嗎?

2009-08-21 19:41:12 補充：

圖片參考：http://s585.photobucket.com/albums/ss296/mathmanliu/sqrtsecx.gif


或參考:http://www.wretch.cc/album/show.php?i=mathmanliu&b=1&f=1740521777&p=147

Note: 此級數目前我求不出closed form!

其實這題曾經有人問過：
http://hk.knowledge.yahoo.com/question/question?qid=7008022703674
不過你找不到這題也絕不出奇，因為這題一定掌握不到準確的關鍵字去找出。

Any method is welcome, as long as it is sure that there's no closed form for the integral.

菩提兄, 很久不見了. 歡迎你重臨.