Hello! I have to find the domain of definition of this function: z = sqrt ( 9 - x^2 - 9y^2 ) Can someone help me please? I think i should use R^2 = ( x^2 - xc ) ^ 2 + ( y - yc ) ^ 2 where R is the radius and (xc,yc) the position of the center of the circle But i don't konw how?

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