This one has no y component and this one has no y component, so this is very easy.

它没有y轴分量,它没有y轴分量，这非常简单。

youdao

You take the y component, take the derivative with respect to x, take the x component, differentiate with respect to y, you should get the same answer. And that is important to know.

对y分量，关于x求导，对x分量，关于y求导，应该得到相同结果，这个知识点很重要。

youdao