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D( y )
3*y^3 = 0
3*y^3 = 0
3*y^3 = 0
3*y^3 = 0 // : 3
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
(15*y^6-(27*y^4))/(3*y^3) = 0
(15*y^6-27*y^4)/(3*y^3) = 0
15*y^6-27*y^4 = 0
3*y^4*(5*y^2-9) = 0
5*y^2 = 9 // : 5
y^2 = 9/5
y^2 = 9/5 // ^ 1/2
abs(y) = (9/5)^(1/2)
y = (9/5)^(1/2) or y = -(9/5)^(1/2)
3*y^4*(y-(9/5)^(1/2))*(y+(9/5)^(1/2)) = 0
(3*y^4*(y-(9/5)^(1/2))*(y+(9/5)^(1/2)))/(3*y^3) = 0
( 3*y^4 )
3*y^4 = 0 // : 3
y^4 = 0
y = 0
( y+(9/5)^(1/2) )
y+(9/5)^(1/2) = 0 // - (9/5)^(1/2)
y = -(9/5)^(1/2)
( y-(9/5)^(1/2) )
y-(9/5)^(1/2) = 0 // + (9/5)^(1/2)
y = (9/5)^(1/2)
y in { 0}
y in { -(9/5)^(1/2), (9/5)^(1/2) }
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