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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(t^-1*((1*2*t)/2))/2 = 0
(t^-1*((2*t)/2))/2 = 0
1/2 = 0
t belongs to the empty set
t belongs to the empty set
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