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向量a在向量b上的投影怎么求
更新时间: 2020-10-23 00:00:00  

向量a在向量b上的投影:设a、b向量的模分别为A、B,两向量夹角为θ,则a在b上的投影大小为Acosθ,而两向量的点积a·b=ABcosθ,所以cosθ=a·b/(AB)。

则a在b上的投影为Acosθ=Aa·b/(AB)=a·b/B

关键词: 向量 投影 怎么

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