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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2/3)*y+4/y = 1/3 // - 1/3
(2/3)*y+4/y-(1/3) = 0
(2/3)*y+4/y-1/3 = 0
2/3*y^1+4*y^-1-1/3*y^0 = 0
(2/3*y^2-1/3*y^1+4*y^0)/(y^1) = 0 // * y^2
y^1*(2/3*y^2-1/3*y^1+4*y^0) = 0
y^1
(2/3)*y^2+(-1/3)*y+4 = 0
(2/3)*y^2+(-1/3)*y+4 = 0
DELTA = (-1/3)^2-(4*4*(2/3))
DELTA = -95/9
DELTA < 0
y in { }
y belongs to the empty set
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