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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)
2/(x^3) = x // - x
2/(x^3)-x = 0
2*x^-3-x = 0
x*(2*x^-4-1) = 0
2*x^-4 = 1 // : 2
x^-4 = 1/2
-4 < 0
1/(x^4) = 1/2 // * x^4
1 = 1/2*x^4 // : 1/2
2 = x^4
x^4 = 2 // ^ 1/4
abs(x) = 2^(1/4)
x = 2^(1/4) or x = -2^(1/4)
x = 0
x = 0
x in { 0}
x in { 2^(1/4), -2^(1/4) }
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