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