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D( x )
y^2 = 0
(4*x^3)/(y^2) = 0
y^2 = 0
y^2 = 0
y^2 = 0
x naleu017Cy do R
(4*x^3)/(y^2) = 0
(4*x^3)/(y^2) = 0
4*x^3*y^-2 = 0 // : 4*y^-2
x^3 = 0
x = 0
x belongs to the empty set
-((4*x^3)/(y^2))^0 = 0
x belongs to the empty set
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