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D( x )
x^1-x^2 = 0
x^1-x^2 = 0
x^1-x^2 = 0
x-x^2 = 0
x-x^2 = 0
DELTA = 1^2-(-1*0*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-1)/(-1*2) or x = (-1^(1/2)-1)/(-1*2)
x = 0 or x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(y^1-y^2)/(x^1-x^2) = 0
(y-y^2)/(x-x^2) = 0
x-x^2 = 0
x*(1-x) = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x*(x-1) = 0
(y-y^2)/(x*(x-1)) = 0
x belongs to the empty set
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