問數~關於三角函數~
回答 (2)
2007-11-26 10:06 am
✔ 最佳答案
cos+cos^2 = 1cos= 1-cos^2 = sin^2
sin^2+sin^6+sin^8
=cos+cos^3+cos^4
=cos+cos^2(cos+cos^2)
=cos+cos^2 (As cos+cos^2=1)
=1 #
參考: me
2007-11-27 12:27 am
收錄日期: 2021-04-23 20:05:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071126000051KK00350