所以说球坐标系,其实就是在rz平面再建立一个极坐标。

So the idea of spherical coordinate is you're going to polar coordinates again in the rz plane.

youdao

接下来有个坏消息就是，不仅要会在xy坐标系里做，还要会在极坐标系里做。

So, the bad news is we have to be able to do it not only in xy coordinates, but also in polar coordinates.

youdao

或者还是用极坐标系，这比直角坐标系更好。

Or I can use polar coordinates,and it works a little bit better that way.

youdao

And similarly, actually, if we're looking at our polar coordinates here, what we see is it's any place where theta is equal to is what's going to put up on the x-y plane.

类似的，如果我们,看这里的极坐标系，我们能看到只要在theta等于,多少的地方就是ｘｙ平面。

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