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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(1/3)*t+1/t-2-1 = -1/3 // + -1/3
(1/3)*t+1/t-(-1/3)-2-1 = 0
(1/3)*t+1/t+1/3-2-1 = 0
1/3*t^1+1*t^-1-8/3*t^0 = 0
(1/3*t^2-8/3*t^1+1*t^0)/(t^1) = 0 // * t^2
t^1*(1/3*t^2-8/3*t^1+1*t^0) = 0
t^1
(1/3)*t^2+(-8/3)*t+1 = 0
(1/3)*t^2+(-8/3)*t+1 = 0
DELTA = (-8/3)^2-(1*4*(1/3))
DELTA = 52/9
DELTA > 0
t = ((52/9)^(1/2)-(-8/3))/(2*(1/3)) or t = (-(-8/3)-(52/9)^(1/2))/(2*(1/3))
t = 3/2*((52/9)^(1/2)+8/3) or t = 3/2*(8/3-(52/9)^(1/2))
t in { 3/2*(8/3-(52/9)^(1/2)), 3/2*((52/9)^(1/2)+8/3)}
t in { 3/2*(8/3-(52/9)^(1/2)), 3/2*((52/9)^(1/2)+8/3) }
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