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D( t )
4*t^2-16+12 = 0
4*t^2-16+12 = 0
4*t^2-16+12 = 0
4*t^2 = 4 // : 4
t^2 = 1
t^2 = 1 // ^ 1/2
abs(t) = 1
t = 1 or t = -1
t in (-oo:-1) U (-1:1) U (1:+oo)
(2*t^2-(6*t)+4)/(4*t^2-16+12) = 0
(2*t^2-6*t+4)/(4*t^2-16+12) = 0
(2*t^2-6*t+4)/(4*t^2-4) = 0
2*t^2-6*t+4 = 0
2*(t^2-3*t+2) = 0
t^2-3*t+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
t = (1^(1/2)+3)/(1*2) or t = (3-1^(1/2))/(1*2)
t = 2 or t = 1
2*(t-1)*(t-2) = 0
(2*(t-1)*(t-2))/(4*t^2-4) = 0
( t-1 )
t-1 = 0 // + 1
t = 1
( t-2 )
t-2 = 0 // + 2
t = 2
t in { 1}
t = 2
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