1 tan(A+B)+tan(A-B)= 2sin2A / cos2A+cos2B
2 sinX-sin 3X = cosX-cos3X
A maths
2007-04-09 6:29 am
回答 (1)
2007-04-09 7:35 am
✔ 最佳答案
(1)圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/April07/Crazytrigo14.jpg
(2)
圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/April07/Crazytrigo15.jpg
(3)
圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/April07/Crazytrigo16.jpg
參考: My Maths knowledge
收錄日期: 2021-04-12 20:31:37
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