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