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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^-1)/2-((2*x^-3)/2) = 0
(X^-1)/2-x^-3 = 0
-1*x^-3 = -(1/2*X^-1) // : -1
x^-3 = 1/2*X^-1
-3 < 0
1/(x^3) = 1/2*X^-1 // * x^3
1 = 1/2*X^-1*x^3 // : 1/2*X^-1
2*X = x^3
x^3 = 2*X // ^ 1/3
x = 2^(1/3)*X^(1/3)
x = 2^(1/3)*X^(1/3)
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