这就是点积。
There is another way that you can find the dot product.
另一个定义,点积的方法。
The dot product, being the product of three scalars, is a scalar.
点积是三个标量的乘积，所以是个标量。
So, product rule is OK for taking the derivative of a dot product.
那么乘积法则对点乘求导没问题。
We can just find the angle using dot product So, how would we do that?
可以直接用点积来,找到这个角的大小，那么，怎么找呢？
We can just find the angle using dot product So, how would we do that?
可以直接用点积来,找到这个角的大小，那么，怎么找呢？
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