之前已經問過，但卻只是有個答非所問的精神病人給了個按計數機就可得到的答案……
今次我嚴正聲明，一定要有詳細計算步驟，而且答案一定要surds form，不要再給我0.017。
到底sin π/180幾多
2006-12-19 11:46 pm
回答 (2)
2006-12-20 12:53 am
✔ 最佳答案
因為你之前無用括號 sin (π/180) , 所以以為你玩, sorry.Even you want to use surd form, the result is very tedious because it involves solving a polynomial equation of 180 degree. The method is using de Moivre's Identity and then expanding and comparing real and imaginary parts. You may refer the following link.
http://mathworld.wolfram.com/deMoivresIdentity.html
2006-12-20 1:50 am
sinπ/180
(Use calculator)
=3.44648064*10^ -4
(Use calculator)
=3.44648064*10^ -4
收錄日期: 2021-05-02 12:33:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061219000051KK01629