1) Show that (tanC+secC-1) / (tanC-secC+1) = (1+sinC) / cosC
2) if (tanA/sinC - tanB/tanC) ^2 = tan^2 A - tan^2 B , show that cosC = tanB/tanA
trigonometry
2008-01-20 9:53 pm
回答 (1)
2008-01-21 4:13 am
✔ 最佳答案
Solution:圖片參考：http://hk.geocities.com/stevieg_1023/tA4.gif
圖片參考：http://hk.geocities.com/stevieg_1023/tA5.gif
收錄日期: 2021-04-14 19:44:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080120000051KK01736