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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)
(4*y^3-(3*y))/(2*y+1) = 0
(4*y^3-3*y)/(2*y+1) = 0
4*y^3-3*y = 0
y*(4*y^2-3) = 0
4*y^2 = 3 // : 4
y^2 = 3/4
y^2 = 3/4 // ^ 1/2
abs(y) = (3/4)^(1/2)
y = (3/4)^(1/2) or y = -(3/4)^(1/2)
y*(y-(3/4)^(1/2))*(y+(3/4)^(1/2)) = 0
(y*(y-(3/4)^(1/2))*(y+(3/4)^(1/2)))/(2*y+1) = 0
( y+(3/4)^(1/2) )
y+(3/4)^(1/2) = 0 // - (3/4)^(1/2)
y = -(3/4)^(1/2)
( y-(3/4)^(1/2) )
y-(3/4)^(1/2) = 0 // + (3/4)^(1/2)
y = (3/4)^(1/2)
( y )
y = 0
y in { -(3/4)^(1/2), (3/4)^(1/2), 0 }
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