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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y+6/y+8 = 0
1*y^1+6*y^-1+8*y^0 = 0
(1*y^2+8*y^1+6*y^0)/(y^1) = 0 // * y^2
y^1*(1*y^2+8*y^1+6*y^0) = 0
y^1
y^2+8*y+6 = 0
y^2+8*y+6 = 0
DELTA = 8^2-(1*4*6)
DELTA = 40
DELTA > 0
y = (40^(1/2)-8)/(1*2) or y = (-40^(1/2)-8)/(1*2)
y = (2*10^(1/2)-8)/2 or y = (-2*10^(1/2)-8)/2
y in { (-2*10^(1/2)-8)/2, (2*10^(1/2)-8)/2}
y in { (-2*10^(1/2)-8)/2, (2*10^(1/2)-8)/2 }
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