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D( X )
(1-X)^3 = 0
(1-X)^3 = 0
(1-X)^3 = 0
1-X = 0 // - 1
-X = -1 // * -1
X = 1
X in (-oo:1) U (1:+oo)
4/((1-X)^3) = 0
4 = 0
X belongs to the empty set
X belongs to the empty set
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