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D( u )
4*u^2 = 0
4*u^2 = 0
4*u^2 = 0
4*u^2 = 0 // : 4
u^2 = 0
u = 0
u in (-oo:0) U (0:+oo)
(36*u^6-(16*u^5))/(4*u^2) = 0
(36*u^6-16*u^5)/(4*u^2) = 0
36*u^6-16*u^5 = 0
4*u^5*(9*u-4) = 0
9*u-4 = 0 // + 4
9*u = 4 // : 9
u = 4/9
4*u^5*(u-4/9) = 0
(4*u^5*(u-4/9))/(4*u^2) = 0
( 4*u^5 )
4*u^5 = 0 // : 4
u^5 = 0
u = 0
( u-4/9 )
u-4/9 = 0 // + 4/9
u = 4/9
u in { 0}
u = 4/9
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