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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)
1/(x^3) = 1 // - 1
1/(x^3)-1 = 0
1*x^-3 = 1 // : 1
x^-3 = 1
-3 < 0
1/(x^3) = 1 // * x^3
1 = 1*x^3 // : 1
1 = x^3
x^3 = 1 // ^ 1/3
x = 1
x = 1
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