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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
4*t-((2*t)/(-2))+1/t+1 = 1 // - 1
4*t-((2*t)/(-2))+1/t-1+1 = 0
t+4*t+1/t-1+1 = 0
5*t^1+1*t^-1 = 0
(5*t^2+1*t^0)/(t^1) = 0 // * t^2
t^1*(5*t^2+1*t^0) = 0
t^1
5*t^2+1 = 0
5*t^2+1 = 0
DELTA = 0^2-(1*4*5)
DELTA = -20
DELTA < 0
t in { }
t belongs to the empty set
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