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D( x )
(x^4)^2 = 0
(x^4)^2 = 0
(x^4)^2 = 0
1*x^8 = 0 // : 1
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((2*y^3)^2)^3)/((x^4)^2) = 0
64*x^-8*y^18 = 0 // : 64*y^18
x^-8 = 0
x należy do O
x belongs to the empty set
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