A)show that sinA + sinB +sin C = 4 cosA/2cosB/2cosC/2
B)Given that a+b+c=2m,by using above result and a/sinA=(a+b+c)/(sinA+sinB+
sinC),
Show a =msin A/2sec B/2secC/2
三角學表示問題
2013-04-08 4:25 am
回答 (1)
2013-04-08 5:54 am
✔ 最佳答案
圖片參考：http://i1096.photobucket.com/albums/g340/pingshek/2013-04-07_zps8bc8cdb5.png
http://i1096.photobucket.com/albums/g340/pingshek/2013-04-07_zps8bc8cdb5.png
參考: pingshek
收錄日期: 2021-04-25 12:51:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130407000051KK00315