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