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D( y )
y^2-(6*y) = 0
y^2-(6*y) = 0
y^2-(6*y) = 0
y^2-6*y = 0
y^2-6*y = 0
DELTA = (-6)^2-(0*1*4)
DELTA = 36
DELTA > 0
y = (36^(1/2)+6)/(1*2) or y = (6-36^(1/2))/(1*2)
y = 6 or y = 0
y in (-oo:0) U (0:6) U (6:+oo)
(y+6)/(y^2-(6*y)) = 0
(y+6)/(y^2-6*y) = 0
y^2-6*y = 0
y*(y-6) = 0
y-6 = 0 // + 6
y = 6
y*(y-6) = 0
(y+6)/(y*(y-6)) = 0
y+6 = 0 // - 6
y = -6
y = -6
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