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