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