求通解...
tan(30°+x) tan(30°-x) = 1-2cos2x
步驟,,thxxx
f4...math,,help............
2007-04-16 1:41 am
回答 (1)
2007-04-16 1:51 am
收錄日期: 2021-04-13 00:42:58
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https://hk.answers.yahoo.com/question/index?qid=20070415000051KK04058