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D( t )
(2*t)^4 = 0
(2*t)^4 = 0
(2*t)^4 = 0
16*t^4 = 0 // : 16
t^4 = 0
t = 0
t in (-oo:0) U (0:+oo)
((((8*t^4)/2)*t^5)/((2*t)^4))/(-6) = 0
-1/24*t^5 = 0 // : -1/24
t^5 = 0
t = 0
t in { 0}
t belongs to the empty set
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