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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) = 0.03 // - 0.03
1/(x^3)-0.03 = 0
1*x^-3 = 0.03 // : 1
x^-3 = 0.03
-3 < 0
1/(x^3) = 0.03 // * x^3
1 = 0.03*x^3 // : 0.03
33.33333333 = x^3
x^3 = 33.33333333 // ^ 1/3
x = 33.33333333^(1/3)
x = 33.33333333^(1/3)
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