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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(4/3)*t+2/t = 4/t+2 // - 4/t+2
(4/3)*t+2/t-(4/t)-2 = 0
(4/3)*t+2/t-4*t^-1-2 = 0
4/3*t^1-2*t^-1-2*t^0 = 0
(4/3*t^2-2*t^1-2*t^0)/(t^1) = 0 // * t^2
t^1*(4/3*t^2-2*t^1-2*t^0) = 0
t^1
(4/3)*t^2-2*t-2 = 0
(4/3)*t^2-2*t-2 = 0
DELTA = (-2)^2-(-2*4*(4/3))
DELTA = 44/3
DELTA > 0
t = ((44/3)^(1/2)+2)/(2*(4/3)) or t = (2-(44/3)^(1/2))/(2*(4/3))
t = 3/8*((44/3)^(1/2)+2) or t = 3/8*(2-(44/3)^(1/2))
t in { 3/8*(2-(44/3)^(1/2)), 3/8*((44/3)^(1/2)+2)}
t in { 3/8*(2-(44/3)^(1/2)), 3/8*((44/3)^(1/2)+2) }
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