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D( x )
(4/9)*x^3 = 0
(4/9)*x^3 = 0
(4/9)*x^3 = 0
4/9*x^3 = 0 // : 4/9
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4/9)*x^3)^-2 = 0
81/16*x^-6 = 0 // : 81/16
x^-6 = 0
x należy do O
x belongs to the empty set
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