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