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u in (-oo:+oo)
u^3*((16*u^6-(12*u^4))/4) = 0
u^3*((16*u^6-12*u^4)/4) = 0
(u^3*(16*u^6-12*u^4))/4 = 0
16*u^6-12*u^4 = 0
4*u^4*(4*u^2-3) = 0
4*u^2 = 3 // : 4
u^2 = 3/4
u^2 = 3/4 // ^ 1/2
abs(u) = (3/4)^(1/2)
u = (3/4)^(1/2) or u = -(3/4)^(1/2)
4*u^4*(u-(3/4)^(1/2))*(u+(3/4)^(1/2)) = 0
(4*u^3*u^4*(u-(3/4)^(1/2))*(u+(3/4)^(1/2)))/4 = 0
( 4*u^4 )
4*u^4 = 0 // : 4
u^4 = 0
u = 0
( u+(3/4)^(1/2) )
u+(3/4)^(1/2) = 0 // - (3/4)^(1/2)
u = -(3/4)^(1/2)
( u-(3/4)^(1/2) )
u-(3/4)^(1/2) = 0 // + (3/4)^(1/2)
u = (3/4)^(1/2)
( u^3 )
1*u^3 = 0 // : 1
u^3 = 0
u = 0
u in { 0, -(3/4)^(1/2), (3/4)^(1/2), 0 }
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