求通解...
tan(30°+x) tan(30°-x) = 1-2cos2x
步驟,,thxxx
f.4 math..唔該幫幫手
2007-04-16 1:57 am
回答 (1)
2007-04-16 2:04 am
收錄日期: 2021-04-13 00:43:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070415000051KK04189