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D( x )
(x^1)/3 = 0
(x^1)/3 = 0
(x^1)/3 = 0
x/3 = 0
1/3*x = 0 // : 1/3
x = 0
x in (-oo:0) U (0:+oo)
((x^1)/3)^-3 = 0
(x/3)^-3 = 0
27*x^-3 = 0 // : 27
x^-3 = 0
x należy do O
x belongs to the empty set
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