We could do it dy dx. Or, maybe we will want to actually make a change of variables to first shift this to the origin, x-2 you know, change x to x minus two and then switch to polar coordinates.
也可以dy，dx来划分，或者,对变量做一下变化，移动到原点，就是把x变成,然后再转化成极坐标。
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The Buyei folk literature in Luoping shows strong and unique deity consciousness for the solicitude of life, especially for the origin of all creatures and the switch of life.