Find function limit

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I have a problem with solving following limit. $$\lim_{(x,y)\rightarrow 0}(x^2+y^2)^{x^2y^2}$$ I tried to estimate it let :$$z=max(x^2,y^2)$$ $$z^{z}\le(x^2+y^2)^{x^2y^2}\le (2z)^{z^2}$$ Using 3 function statment i get that limit is 1 where Wolfram shows 0. Will be more than glad for help.

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Hint: Convert to polar coordinates.