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