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D( t )
t^2+2*t+1 = 0
t^2+2*t+1 = 0
t^2+2*t+1 = 0
t^2+2*t+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
t = -2/(1*2)
t = -1 or t = -1
t in (-oo:-1) U (-1:+oo)
(t^2+10*t+9)/(t^2+2*t+1) = 0
t^2+10*t+9 = 0
t^2+10*t+9 = 0
DELTA = 10^2-(1*4*9)
DELTA = 64
DELTA > 0
t = (64^(1/2)-10)/(1*2) or t = (-64^(1/2)-10)/(1*2)
t = -1 or t = -9
(t+9)*(t+1) = 0
t^2+2*t+1 = 0
t^2+2*t+1 = 0
DELTA = 2^2-(1*1*4)
DELTA = 0
t = -2/(1*2)
t = -1 or t = -1
(t+1)^2 = 0
((t+9)*(t+1))/((t+1)^2) = 0
( t+1 )
t+1 = 0 // - 1
t = -1
( t+9 )
t+9 = 0 // - 9
t = -9
t in { -1}
t = -9
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