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备忘:向量的点乘与叉乘公式

向量:u=(u1,u2,u3) v=(v1,v2,v3)

叉积公式:u x v = { u2v3-v2u3 , u3v1-v3u1 , u1v2-u2v1 }

点积公式:u * v = u1v1+u2v2+u3v3

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