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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^2-(4*y)+6)/y = 0
(y^2-4*y+6)/y = 0
y^2-4*y+6 = 0
y^2-4*y+6 = 0
DELTA = (-4)^2-(1*4*6)
DELTA = -8
DELTA < 0
1 = 0
1/y = 0
y belongs to the empty set
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