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叉乘的幾何意義是:如向量x叉乘向量y就是右手四指與x方向相同向y方向彎曲,大拇指的方向就是,叉乘結果的方向,大小的x和y所圍的面積
點乘,也叫向量的內積、數量積.顧名思義,求下來的結果是一個數.點積:(x1,y1,z1).(x2,y2,z2)= x1x2 + y1y2 + z1z2點積可以來計算兩向量的夾角,公式如下:cos(V ^ W)=V.W / | V | | W |點乘的幾何意義是:…
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