cos12°cos24°cos48°cos84°怎麼算請給我算法?
回答 (1)
2016-10-13 3:25 pm
✔ 最佳答案
SolA=Cos12°Cos24°Cos48°Cos84°
16ASin12°
=16Sin12°Cos12°Cos24°Cos48°Cos84°
=8Sin24°Cos24°Cos48°Cos84°
=4Sin48°Cos48°Cos84°
=2Sin96°Cos84°
=2Sin84°Cos84°
=Sin168°
=Sin12°
A=1/16
收錄日期: 2021-04-30 22:00:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161013054415AANKXza