唔難做maths第2回
回答 (2)
2007-04-12 4:31 am
✔ 最佳答案
tanXsinX + cosX = 2(sinX / cosX) sinX + cos X = 2
((sinX)^2) / cosX + cos X = 2
(sinX)^2 + (cos X)^2 = 2cosX
1 = 2cosX
cosX = 0.5
X = 60* or 300*
參考: me
2007-04-12 4:29 am
tanXsinX+cosX=2
X=60
X=60
收錄日期: 2021-04-23 21:28:01
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070411000051KK05365