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D( x )
x^4 = 0
x = 0
((z^0*x^-1*y^3)/(x^4))*y^8 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x = 0
x = 0
((z^0*x^-1*y^3)/(x^4))*y^8 = 0
((z^0*x^-1*y^3)/(x^4))*y^8 = 0
((x^-1*y^3)/(x^4))*y^8 = 0
x^-5*y^11 = 0 // : y^11
x^-5 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((z^0*x^-1*y^3)/(x^4))*y^8)^-2 = 0
(((x^-1*y^3)/(x^4))*y^8)^-2 = 0
x^10*y^-22 = 0 // : y^-22
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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