請詳細步驟教我計下條 :
(不要綱址回答)
Find the maximum and minimum values of sine and cosine functions :
1. y=2sin3x-7
2. y=6cos(4x-110度)
3. y=(2sinx-3)^2
4. y=5+4cos^2(x+40度)
一定要計法步驟. 唔該.
急! F4 Basic Trigonometry ex4
2012-10-20 7:59 am
回答 (1)
2012-10-20 3:45 pm
✔ 最佳答案
Find the maximum andminimum values of sine and cosine functions :1. y=2Sin3x－7
Sol
－1<=Sin3x<=1
－2<=2Sin3x<=2
－2－7<=2Sin3x－7<=2－7
－9<=y<=－5
2. y=6Cos(4x－110度)
Sol
－1<=Cos(4x－110度)<=1
－6=6Cos(4x－110度)<=6
－6<=y<=6
3. y=(2Sinx－3)^2
Sol
－1<=Sinx<=1－2<=2Sinx<=2
－5<=2Sinx－3<=－1
1<=(2Sinx－3)<=25
1<=y<=25
4. y=5+4Cos^2(x+40度)
Sol
0<=Cos^2(x+40度)<=1
0<=4Cos^2(x+40度)<=4
5+0<=5+4Cos^2(x+40度)<=5+4
5<=y<=9
收錄日期: 2021-04-13 19:04:30
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