sin(360-x)/tan(x-180)+1/cos(360-x)-cos(x-360)
我唔識呢part :-cos(x-360)
F.4 maths(sincostan)
2011-02-21 4:08 am
回答 (1)
2011-02-21 4:15 am
✔ 最佳答案
-cos(x-360)=-cos[(x-360)+360]=-cosx
收錄日期: 2021-04-22 00:53:09
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110220000051KK01417