is that d^2(x)/d(t)^2=1/ [ d(t)^2/d^2(x) ] ???
i just know that it is true for first derivative, but is it also true for n-th derivative?
收錄日期: 2021-04-13 16:34:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070321000051KK00902