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