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Nov 20 at 0:21 comment added LSpice Since this is not an answer, it might have been better to post it as a comment.
Nov 19 at 20:10 comment added Alan Ah yes, there's this method of $N(x,y)dx+M(x,y)dy=dF$ which is learnt in undergraduate, but I can't remember how this method conditues.
Nov 19 at 20:07 history answered Alan CC BY-SA 4.0