更新1:
x is greater 或 equal 0和 smaller or equal 360
2002 ce maths mc 48
回答 (1)
2008-03-27 2:49 am
✔ 最佳答案
tan x = 2 sin xsinx /cosx =2 sinx
sinx=2sinx cosx
sinx (1-2cosx)=0
sinx =0 or cosx =1/2
x = 0, 180,360 or x=60,300
so there is 5 roots
參考: my math knowledge
收錄日期: 2021-04-29 21:47:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080326000051KK02845