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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^-3)/2 = 1/729 // - 1/729
(X^-3)/2-(1/729) = 0
(X^-3)/2-1/729 = 0
1/2*X^-3 = 1/729 // : 1/2
X^-3 = 2/729
-3 < 0
1/(X^3) = 2/729 // * X^3
1 = 2/729*X^3 // : 2/729
729/2 = X^3
X^3 = 729/2 // ^ 1/3
X = (729/2)^(1/3)
X = (729/2)^(1/3)
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