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我们知道,利用空间向量的数量积运算可以很方便地计算空间角的大小,证明空间中的平行与垂直关系.实际上,广义地看,垂直关系就是对应的角的大小为
We know that the use of the scalar product of the space vector can easily calculate the size of the space angle and prove the parallel and vertical relationship in space. In fact, in a broad sense, the vertical relationship is the size of the corresponding angle.