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epsilon and delta definition of limit

kidia
in Analysis and Calculus

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Can anyone help me on this question,Using [math]\epsilon[/math]-[math]\delta[/math] definition of a limit to show that

 

[math]\lim[/math] [math]\frac {2x^3-y^3}{x^2+y^2}[/math] = 0

(x,y)[math]\rightarrow[/math](0,0)

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