The usual change of variables in this case (mentioned in the title of this topic) is this:(adsbygoogle = window.adsbygoogle || []).push({});

##x = rcos(t)##

##y = rsin(t)##

When I rewrite (say my integral) in polar coordinates I have to change ##dxdy## to ##rdrdt##

My question is why can't I just compute dx and dy the usual way (the already mentioned change of variables) meaning finding the complete differentials dx and dy, multiplying them together, etc.?

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# Cartesian coordinates to Polar coordinates (dx,dy question)

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