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D( x )
x^12 = 0
((z^0*x^4*y^9)/(x^12))*y^-3 = 0
x^12 = 0
x^12 = 0
1*x^12 = 0 // : 1
x^12 = 0
x = 0
((z^0*x^4*y^9)/(x^12))*y^-3 = 0
((z^0*x^4*y^9)/(x^12))*y^-3 = 0
((x^4*y^9)/(x^12))*y^-3 = 0
x^-8*y^6 = 0 // : y^6
x^-8 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(((z^0*x^4*y^9)/(x^12))*y^-3)^-3 = 0
(((x^4*y^9)/(x^12))*y^-3)^-3 = 0
x^24*y^-18 = 0 // : y^-18
x^24 = 0
x = 0
x in { 0}
x belongs to the empty set
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