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