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D( x )
x^3 = 0
6/(x^3) = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
6/(x^3) = 0
6/(x^3) = 0
6*x^-3 = 0 // : 6
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((2*x^2)/3)/(6/(x^3)) = 0
1/9*x^5 = 0 // : 1/9
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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