Given that x is the angle between two non-zero vectors a and b
Prove that │a-b│^2 = │a│^2 +│b│^2 -2│a││b│cosx
vectors
2010-09-03 10:33 pm
回答 (2)
2010-09-03 11:15 pm
✔ 最佳答案
As follows:圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/04-92.jpg
2010-09-03 17:58:19 補充：
係?! 請指教一下
2010-09-04 12:17:18 補充：
多謝NELSON你的意見!
2010-09-04 5:49 pm
應該係無乜問題,可能係話無講明x=0同(a-b)(a-b)中間漏左一點
收錄日期: 2021-04-22 00:54:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100903000051KK00518