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I need to find and sketch the domain for:

[tex]f(x,y)= \frac{x^2 + y^3}{x^2 + y^2 -1}[/tex]

The way i see it, that would only be undefined when the denominator is equal to zero. So wouldn't the domain simply be:

D={(x,y)|x^2+y^2-1 /= 0}

Right?