a) Slove cos2x=sin28 (0<x<90)
b) Slove 3(sinx)^2+sinx cosx= 1 (0<x<90)
收錄日期: 2021-04-13 16:23:26
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090122000051KK01555