sinA-cosA=0,其中90<270
3cosA+4sinA=0,其中270<360
中4數學,唔該,列步驟
2008-02-25 5:52 am
回答 (1)
2008-02-25 6:09 am
✔ 最佳答案
sinA - cosA = 0sinA = cosA
tanA = 1
A = 225
3cosA + 4sinA = 0
cosA = -4sinA/3
tanA = -3/4
A = 323.1
收錄日期: 2021-04-13 15:12:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080224000051KK04947