1. Solve the equation cos^2 O - 3cos O +2 =0
2. Given two points A(-2,4) and B(3,1)
i) Find the slope of the line joining AB
ii)Find the equation of the line AB
PS: ^=指數 O="fi-ter"
10分 3題數
2009-07-09 8:22 am
回答 (1)
2009-07-09 8:55 am
✔ 最佳答案
1. cos2 θ - 3cosθ+2 =0
(cosθ-2)(cosθ-1)=0
cosθ=2(reject) or cosθ=1
θ=2nΠ,where n is an integer.
2. i)
slope of AB= (4-1) / (-2-3)
=-3/5
ii)
the equation of AB
y-4=-3/5[x-(-2))
5y-20=-3(x+2)
3x+5y-14=0
收錄日期: 2021-04-23 20:38:20
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https://hk.answers.yahoo.com/question/index?qid=20090709000051KK00058