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D( t )
t+1 = 0
t = 0
t+1 = 0
t+1 = 0
t+1 = 0 // - 1
t = -1
t = 0
t = 0
t in (-oo:-1) U (-1:0) U (0:+oo)
(t-3)/(t+1) = 2-(3/t) // - 2-(3/t)
(t-3)/(t+1)+3/t-2 = 0
(t*(t-3))/(t*(t+1))+(3*(t+1))/(t*(t+1))+(-2*t*(t+1))/(t*(t+1)) = 0
t*(t-3)+3*(t+1)-2*t*(t+1) = 0
t^2-2*t^2-2*t+3 = 0
3-t^2-2*t = 0
3-t^2-2*t = 0
3-t^2-2*t = 0
DELTA = (-2)^2-(-1*3*4)
DELTA = 16
DELTA > 0
t = (16^(1/2)+2)/(-1*2) or t = (2-16^(1/2))/(-1*2)
t = -3 or t = 1
(t+3)*(t-1) = 0
((t+3)*(t-1))/(t*(t+1)) = 0
((t+3)*(t-1))/(t*(t+1)) = 0 // * t*(t+1)
(t+3)*(t-1) = 0
( t+3 )
t+3 = 0 // - 3
t = -3
( t-1 )
t-1 = 0 // + 1
t = 1
t in { -3, 1 }
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