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D( u )
u^4 < 0
u^4 < 0
u^4 < 0
1*u^4 < 0
1*u^4 < 0 // : 1
u^4 < 0/1
u^4 < 0
u belongs to the empty set
u in (-oo:+oo)
(u^4)^(5/8) = 0
1*u^(5/2) = 0 // : 1
u^(5/2) = 0
u = 0
u = 0
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