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