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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^6*y^4)/(x^4))*y^2 = 0
x^2*y^6 = 0 // : y^6
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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