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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y-(1/y)-2+3 = (5/2)*y+6 // - (5/2)*y+6
3/y-((5/2)*y)-(1/y)-6-2+3 = 0
(-5/2)*y+3/y-y^-1-6-2+3 = 0
2*y^-1-5/2*y^1-5*y^0 = 0
(2*y^0-5/2*y^2-5*y^1)/(y^1) = 0 // * y^2
y^1*(2*y^0-5/2*y^2-5*y^1) = 0
y^1
(-5/2)*y^2-5*y+2 = 0
(-5/2)*y^2-5*y+2 = 0
DELTA = (-5)^2-(2*4*(-5/2))
DELTA = 45
DELTA > 0
y = (45^(1/2)+5)/(2*(-5/2)) or y = (5-45^(1/2))/(2*(-5/2))
y = (3*5^(1/2)+5)/(-5) or y = (5-3*5^(1/2))/(-5)
y in { (3*5^(1/2)+5)/(-5), (5-3*5^(1/2))/(-5)}
y in { (3*5^(1/2)+5)/(-5), (5-3*5^(1/2))/(-5) }
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