find the maximum value for
7cosθ＋24sinθ
options:
(A)7(B)24(C)25(D)31
AL trigonometry
2009-12-31 7:20 am
回答 (1)
2009-12-31 7:28 am
✔ 最佳答案
7cosθ＋24sinθ=25[(7/25)cosθ＋(24/25)sinθ]
=25[(7/25)cosθ＋(24/25)sinθ]
=25[cosxcosθ＋sinxsinθ]
=25cos(x-θ)
Since -1<=cos(x-θ)<=1, the max. value is 25
收錄日期: 2021-04-26 14:00:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091230000051KK02226