If 2cos角度=3x-1, when θ is any angle, find the range of values of x
有人話 :
Since range of cosine is - 1 to + 1, that is 3x - 1 is between - 2 and + 2
- 2 < 3x - 1 < 2
(點計出 -2 and +2 )
急!F5 inequalities unknown 2q4
2012-10-04 1:49 am
回答 (1)
2012-10-04 1:58 am
✔ 最佳答案
-1<cosθ<1-2<2cosθ<2
'.'2cosθ=3x-1
.'.-2<3x-1<2
收錄日期: 2021-04-13 19:01:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20121003000051KK00351