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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
t+2/t = -3 // + 3
t+2/t+3 = 0
1*t^1+2*t^-1+3*t^0 = 0
(1*t^2+3*t^1+2*t^0)/(t^1) = 0 // * t^2
t^1*(1*t^2+3*t^1+2*t^0) = 0
t^1
t^2+3*t+2 = 0
t^2+3*t+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
t = (1^(1/2)-3)/(1*2) or t = (-1^(1/2)-3)/(1*2)
t = -1 or t = -2
t in { -2, -1}
t in { -2, -1 }
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