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D( x )
x^(2/3) = 0
x^(2/3) = 0
x^(2/3) = 0
1*x^(2/3) = 0 // : 1
x^(2/3) = 0
x = 0
x in (-oo:0) U (0:+oo)
1/(x^(2/3)) = 1 // - 1
1/(x^(2/3))-1 = 0
1*x^(-2/3) = 1 // : 1
x^(-2/3) = 1
-2/3 < 0
1/(x^(2/3)) = 1 // * x^(2/3)
1 = 1*x^(2/3) // : 1
1 = x^(2/3)
x^(2/3) = 1 // ^ 3
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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