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