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