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