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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t^-3*((t^5)/2) = 0
1/2*t^2 = 0 // : 1/2
t^2 = 0
t = 0
t in { 0}
t belongs to the empty set
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