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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(X^-3)/2 = 125 // - 125
(X^-3)/2-125 = 0
1/2*X^-3 = 125 // : 1/2
X^-3 = 250
-3 < 0
1/(X^3) = 250 // * X^3
1 = 250*X^3 // : 250
1/250 = X^3
X^3 = 1/250 // ^ 1/3
X = (1/250)^(1/3)
X = (1/250)^(1/3)
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