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Evaluate the liit of (x^4+y^4)/((x^2+y^2)^(3/2)) when (x,y) approaches (0,0)

I'm trying to replace x and y with rcost and ycost, but it seems too complex. How can I abbreviate the equation?

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I solved it myself...The limit is 0.

I'm trying to replace x and y with rcost and ycost, but it seems too complex. How can I abbreviate the equation?

................

I solved it myself...The limit is 0.

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