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