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t in (-oo:+oo)
(8*t^2-(24*t)+10)/4 = 0
(8*t^2-24*t+10)/4 = 0
8*t^2-24*t+10 = 0
2*(4*t^2-12*t+5) = 0
4*t^2-12*t+5 = 0
DELTA = (-12)^2-(4*4*5)
DELTA = 64
DELTA > 0
t = (64^(1/2)+12)/(2*4) or t = (12-64^(1/2))/(2*4)
t = 5/2 or t = 1/2
2*(t-1/2)*(t-5/2) = 0
(2*(t-1/2)*(t-5/2))/4 = 0
( t-1/2 )
t-1/2 = 0 // + 1/2
t = 1/2
( t-5/2 )
t-5/2 = 0 // + 5/2
t = 5/2
t in { 1/2, 5/2 }
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