lim (x,y)→(0,0) (yx^2)/(x^4+y^2)
I don't know how to solve this multi-variable limit with polar coordinates. I tried but it gives me zero and the answer is that this limit doesn't exist.
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This may help. – user Nov 01 '20 at 14:52
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This precise question has appeared probably a dozen times on this site. You should learn to search and read what's already here before posting questions. – Ted Shifrin Nov 01 '20 at 22:41