dot product,norms of vectors
2009-05-18 5:23 pm
回答 (1)
2009-05-18 6:49 pm
✔ 最佳答案
||x+y||^2=<x+y,x+y>=||x||^2+2<x,y>+||y||^2=><x,y>=[||x+y||^2-(||x||^2+||y||^2)]/2
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090518000051KK00304