... Deriving Dot Product Algebraically （用代数方法来继承点积） Dot Product Example （点积示例） Dot Product Example 2 （点积示例2） ...
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Let us take a down-to-earth example of a dot product.
举一个点积的，现实例子。
And, in some cases, for example, if you know that the vector field is tangent to the curve or if a dot product is constant or things like that then that might actually give you a very easy answer.
例如，在某些情况下，如果已知向量场与曲线相切，或者内积是一个常数等等，那么结果将会很简单。
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