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D( u )
3*u^2 = 0
3*u^2 = 0
3*u^2 = 0
3*u^2 = 0 // : 3
u^2 = 0
u = 0
u in (-oo:0) U (0:+oo)
(12*u^6-(15*u^5))/(3*u^2) = 0
(12*u^6-15*u^5)/(3*u^2) = 0
12*u^6-15*u^5 = 0
3*u^5*(4*u-5) = 0
4*u-5 = 0 // + 5
4*u = 5 // : 4
u = 5/4
3*u^5*(u-5/4) = 0
(3*u^5*(u-5/4))/(3*u^2) = 0
( 3*u^5 )
3*u^5 = 0 // : 3
u^5 = 0
u = 0
( u-5/4 )
u-5/4 = 0 // + 5/4
u = 5/4
u in { 0}
u = 5/4
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