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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-1/3) = 1/2 // - 1/2
x^(-1/3)-(1/2) = 0
x^(-1/3)-1/2 = 0
1*x^(-1/3) = 1/2 // : 1
x^(-1/3) = 1/2
-1/3 < 0
1/(x^(1/3)) = 1/2 // * x^(1/3)
1 = 1/2*x^(1/3) // : 1/2
2 = x^(1/3)
x^(1/3) = 2 // ^ 3
x = 8
x = 8
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