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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8*y-(y/3)-y+1/y-6-3 = 0
20/3*y^1+1*y^-1-9*y^0 = 0
(20/3*y^2-9*y^1+1*y^0)/(y^1) = 0 // * y^2
y^1*(20/3*y^2-9*y^1+1*y^0) = 0
y^1
(20/3)*y^2-9*y+1 = 0
(20/3)*y^2-9*y+1 = 0
DELTA = (-9)^2-(1*4*(20/3))
DELTA = 163/3
DELTA > 0
y = ((163/3)^(1/2)+9)/(2*(20/3)) or y = (9-(163/3)^(1/2))/(2*(20/3))
y = 3/40*((163/3)^(1/2)+9) or y = 3/40*(9-(163/3)^(1/2))
y in { 3/40*(9-(163/3)^(1/2)), 3/40*((163/3)^(1/2)+9)}
y in { 3/40*(9-(163/3)^(1/2)), 3/40*((163/3)^(1/2)+9) }
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