x=cost , y=sint,
find (d^2 y)/ (d x^2),
the answer is -1/sin^3 t, please show how u do it~thanks
收錄日期: 2021-04-25 22:36:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090513000051KK00664