maths
回答 (2)
2008-01-23 9:04 pm
✔ 最佳答案
sin²x+2cosx+3=(1-cos²x)+2cosx+3
= -cos²x+2cosx+4
max. value of cos x = 1
so, the max. value of sin²x+2cosx+3 = 5
參考: me
2008-01-24 2:07 am
5!!!!!!!!!!!!!!!!!!!!!!!!!!!
收錄日期: 2021-04-20 13:03:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080123000051KK00972