解 3 角方程6-9
2011-03-09 4:30 am
6. sin x +sin3x+ sin5X/ cosx+cos3x+ cos5x =1
7.sin3x-sinx =√3(cos3x + cosx)
8. 4sin^2 x + 4cosx -1 =0
9. tan^2x =1+ sec x
回答 (1)
2011-03-09 8:06 am
收錄日期: 2021-04-23 23:24:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110308000051KK01258