q.1
if tan(theta)= -2 and cos(theta)<0,find sin(theta)
q.2
if tan(theta)= -3,where 90度 < theta <180度,find the value of
[sin(theta) + cos (theta)] / [sin(theta) - 2cos (theta)]
收錄日期: 2021-05-03 05:46:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070614000051KK05061