If you do the dot product with i hat, you will get the first component 0 that will be x1. One times x1 plus zero, zero.
如果你用i做点乘，你能得到第一个分量,那就是x1，1*x1+0
If you do the dot product with i hat, you will get the first component 0 that will be x1. One times x1 plus zero, zero.
如果你用i做点乘，你能得到第一个分量,那就是x1，1*x1+0
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