我翻譯好像有錯 原題目是
The formula for the length L of the curve x= f (t), y =g(t),a≦t≦b, is L=?
收錄日期: 2021-05-01 09:36:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140513000016KK00428