Espressione 1: "x" squared plus "y" Superscript, 2 , Baseline equals 3 "z" squared left brace, negative 1 half less than or equal to "z" less than or equal to 1 half , right bracex2+y2=3z2−12≤z≤12
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Espressione 2: "x" squared plus "y" squared plus "z" squared equals 1x2+y2+z2=1
