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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
7/t = 1/3-((4/3)*t) // - 1/3-((4/3)*t)
(4/3)*t+7/t-(1/3) = 0
(4/3)*t+7/t-1/3 = 0
4/3*t^1+7*t^-1-1/3*t^0 = 0
(4/3*t^2-1/3*t^1+7*t^0)/(t^1) = 0 // * t^2
t^1*(4/3*t^2-1/3*t^1+7*t^0) = 0
t^1
(4/3)*t^2+(-1/3)*t+7 = 0
(4/3)*t^2+(-1/3)*t+7 = 0
DELTA = (-1/3)^2-(4*7*(4/3))
DELTA = -335/9
DELTA < 0
t in { }
t belongs to the empty set
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