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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(1/3)*t+1/t = 1/2 // - 1/2
(1/3)*t+1/t-(1/2) = 0
(1/3)*t+1/t-1/2 = 0
1/3*t^1+1*t^-1-1/2*t^0 = 0
(1/3*t^2-1/2*t^1+1*t^0)/(t^1) = 0 // * t^2
t^1*(1/3*t^2-1/2*t^1+1*t^0) = 0
t^1
(1/3)*t^2+(-1/2)*t+1 = 0
(1/3)*t^2+(-1/2)*t+1 = 0
DELTA = (-1/2)^2-(1*4*(1/3))
DELTA = -13/12
DELTA < 0
t in { }
t belongs to the empty set
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