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