請教以下三角函數問題
回答 (3)
2009-10-14 8:48 pm
✔ 最佳答案
Let x= sin20cos20cos40cos80then 8x= 8sin20cos20cos40cos80
= 4sin40cos40cos80
= 2sin80cos80
=sin160
=0.342
Therefore x= 0.342/8
= 0.043
2009-10-21 6:51 am
2009-10-10 8:34 pm
是不容許按計算機還是甚麼
收錄日期: 2021-04-23 23:20:03
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https://hk.answers.yahoo.com/question/index?qid=20091010000051KK00609