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D( t )
4*t^3 = 0
4*t^3 = 0
4*t^3 = 0
4*t^3 = 0 // : 4
t^3 = 0
t = 0
t in (-oo:0) U (0:+oo)
(5*t^3)/(4*t^3) = 0
5/4 = 0
t belongs to the empty set
t belongs to the empty set
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