벡터의곱은내적과외적으로나눌수있습니다.두벡터x=(x1i,x2j,x3k),y=(y1i,y2j,y3k)에대해내적x·y=x1y1+x2y2+x3y3입니다외적x×y=(x2y3-x3y2)i+(x3y1-x1y3)j+(x1y2-
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