The following is an MC question.
If 0<_x<_360, solve (cos x -3)(3sin x -2)=0, corr. to 3.s.f
A. 0.730 or 1.23
B.0.730 or 2.41
C.0.730 or 3.87
I cannot solve this question. Please help me to solve this problem, thank you so much!
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Maths question
2012-06-14 12:49 am
回答 (1)
2012-06-14 3:21 am
✔ 最佳答案
cos x - 3 = 0cos x = 3
no solution since cos x < 1.
3 sinx - 2 = 0
sin x = 2/3
x = 41.81 or 138.19 degree
= 0.730 or 2.41 radians.
so answer is B.
收錄日期: 2021-04-25 22:38:07
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120613000051KK00380