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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(9/2)*t+3/t = 1 // - 1
(9/2)*t+3/t-1 = 0
9/2*t^1+3*t^-1-1*t^0 = 0
(9/2*t^2-1*t^1+3*t^0)/(t^1) = 0 // * t^2
t^1*(9/2*t^2-1*t^1+3*t^0) = 0
t^1
(9/2)*t^2-t+3 = 0
(9/2)*t^2-t+3 = 0
DELTA = (-1)^2-(3*4*(9/2))
DELTA = -53
DELTA < 0
t in { }
t belongs to the empty set
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