設k為整數,化簡下列各式。
(a)tan(180k˚+α)
(b)cos(360k˚+α)
(c)sin[180k˚+(-1)kα]
a-maths!!!!
2008-04-08 1:12 am
回答 (1)
2008-04-08 1:38 am
✔ 最佳答案
(a)tan(180k˚+α)=tan(180˚+α)
=tanα
(b)cos(360k˚+α)
=cos(360˚+α)
=cosα
(c)sin[180k˚+(-1)kα]
=sin(180k˚-kα)
=sin(180˚-α)
=sinα
p.s.據我所知....個k係廢既..唔洗理...
參考: 自己
收錄日期: 2021-04-23 20:32:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080407000051KK01549