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