更新1:
If sin@=-3/4 , 180'
a maths
2008-01-13 9:14 am
If sin@=-3/4 , 180'<@<270. Find the value of cos @ - cot@ and express your ans in surd form.
回答 (2)
2008-01-13 9:30 am
✔ 最佳答案
sin@= -3/4cos@= -√(4^2-3^2) /4 =-(√7)/4
cot@ = (-(√7)/4) / (-3/4) = (√7)/3
cos @ - cot@ = -(√7)/4 - (√7)/3 = -(7√7)/12
參考: 自己計
2008-01-13 9:26 am
sin@=-3/4 , @=-47, 12
2008-01-13 01:28:23 補充：
？caution
2008-01-13 01:28:23 補充：
？caution
收錄日期: 2021-04-19 23:15:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080113000051KK00326