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D( x )
x^3-x = 0
x^3-x = 0
x^3-x = 0
x^3-x = 0
x*(x^2-1) = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x = 0
x = 0
x in (-oo:-1) U (-1:0) U (0:1) U (1:+oo)
(x^2+x)/(x^3-x) = 0
x^2+x = 0
x*(x+1) = 0
x+1 = 0 // - 1
x = -1
x*(x+1) = 0
x^3-x = 0
x*(x^2-1) = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x*(x-1)*(x+1) = 0
(x*(x+1))/(x*(x-1)*(x+1)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x )
x = 0
x in { -1}
x in { 0}
x belongs to the empty set
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