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D( y )
4*y^3 = 0
4*y^3 = 0
4*y^3 = 0
4*y^3 = 0 // : 4
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
(32*y^6-(20*y^4))/(4*y^3) = 0
(32*y^6-20*y^4)/(4*y^3) = 0
32*y^6-20*y^4 = 0
4*y^4*(8*y^2-5) = 0
8*y^2 = 5 // : 8
y^2 = 5/8
y^2 = 5/8 // ^ 1/2
abs(y) = (5/8)^(1/2)
y = (5/8)^(1/2) or y = -(5/8)^(1/2)
4*y^4*(y-(5/8)^(1/2))*(y+(5/8)^(1/2)) = 0
(4*y^4*(y-(5/8)^(1/2))*(y+(5/8)^(1/2)))/(4*y^3) = 0
( 4*y^4 )
4*y^4 = 0 // : 4
y^4 = 0
y = 0
( y+(5/8)^(1/2) )
y+(5/8)^(1/2) = 0 // - (5/8)^(1/2)
y = -(5/8)^(1/2)
( y-(5/8)^(1/2) )
y-(5/8)^(1/2) = 0 // + (5/8)^(1/2)
y = (5/8)^(1/2)
y in { 0}
y in { -(5/8)^(1/2), (5/8)^(1/2) }
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