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D( x )
(1/3)*x^4*y^-3 = 0
(1/3)*x^4*y^-3 = 0
(1/3)*x^4*y^-3 = 0
1/3*x^4*y^-3 = 0 // : 1/3*y^-3
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((1/3)*x^4*y^-3)^-2 = 0
9*x^-8*y^6 = 0 // : 9*y^6
x^-8 = 0
x naleu017Cy do O
x belongs to the empty set
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