Funciones de varias variables

Encuentra el dominio de la función f(x,y)=(x² + y²– 81)^1/2

{(x,y)∈R^{2 |}x² + y² ≤ 81}

{(x,y)∈R^{2 |}x² + y² – 81 > 0}

{(x,y)∈R^{2 |}x² + y²≥ 81}

{(x,y)∈R^{2 |}x² + y² – 81 ≠ 0}

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