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D( x )
x^2*(x-1) = 0
x^2*(x-1) = 0
x^2*(x-1) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:1) U (1:+oo)
1/(x^2*(x-1)) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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