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D( x )
(((-x)^4)/9)*y^2 = 0
(((-x)^4)/9)*y^2 = 0
(((-x)^4)/9)*y^2 = 0
1/9*x^4*y^2 = 0 // : 1/9*y^2
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^3)/3)*y)/((((-x)^4)/9)*y^2) = 0
3*x^-1*y^-1 = 0 // : 3*y^-1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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