又 一條數題
回答 (3)
2008-03-28 11:47 pm
✔ 最佳答案
sin2θ=0.5sin2θ=sin30
2θ=30 or 180-30 or 360+30 or 540-30
θ=15 or 75 or 165 or 255
2008-03-28 15:47:17 補充：
sorry, 165=>195
2008-03-28 15:53:35 補充：
For mashi_yuki29:
Because it is sin2θ
0<=θ>=360
0<=θ>=720
2008-03-29 2:50 am
equation:sin2θ=0.5(0°≦θ≦360°)
sin2θ=0.5
2θ=π/6+2kπ
sin2θ=0.5
2θ=π/6+2kπ
2008-03-28 11:42 pm
2 個roots
sin2θ=1/2
2θ=30 or 2θ=150
θ=15 or θ=75
sin2θ=1/2
2θ=30 or 2θ=150
θ=15 or θ=75
收錄日期: 2021-04-19 21:36:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080328000051KK01888