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为什么偏导数是法向量
更新时间: 2020-10-31 00:00:00  

偏导数是法向量因为在曲面上任一点M取一条曲线,对曲面求偏导,即对这条曲线求切向量,再在M点取另一条曲线,同样求出切向量,这些切向量必在同一平面内,即切平面,而切平面必存在一个法向量,这个法向量必与切向量垂直,同时也是曲面方程求偏导的结果。

关键词: 为什么 向量

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