- #1

- 109

- 1

##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.?