Multivariate Limit of (x^4 + y^4)/(x^2 + y^2) using Polar Coordinates

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Multivariate Limit of (x^4 + y^4)/(x^2 + y^2) using Polar Coordinates
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very useful, indeed ! thanks for posting this ! :)

rosaliademartino
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hi! What if I got r^2(cos^4(a) - sin^4(a)) (- instead of +)? Will it affect the answer?

baronmunchausen
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Why don't we replace y=0 and y=x to prove if the limit exists?

_Dalember_