係 more trigonametry
solve the following equations
Q1 2 sinx = tanx
THX...
諗極都諗唔到呀..
2007-12-07 8:22 am
回答 (1)
2007-12-07 8:31 am
✔ 最佳答案
2sinx = tanx2sinx = sinx/cosx
2sinx cosx = sinx
2sinx cosx - sinx = 0
sinx (2cosx -1) = 0
sinx = 0 or 2cosx -1 =0
x= 180n or cosx = 1/2
x = 360n +/- 60
n is any integer
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071207000051KK00092