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D( t )
t^2-(3*t) = 0
t^2-9 = 0
t^2-(3*t) = 0
t^2-(3*t) = 0
t^2-3*t = 0
t^2-3*t = 0
DELTA = (-3)^2-(0*1*4)
DELTA = 9
DELTA > 0
t = (9^(1/2)+3)/(1*2) or t = (3-9^(1/2))/(1*2)
t = 3 or t = 0
t^2-9 = 0
t^2-9 = 0
1*t^2 = 9 // : 1
t^2 = 9
t^2 = 9 // ^ 1/2
abs(t) = 3
t = 3 or t = -3
t in (-oo:-3) U (-3:0) U (0:3) U (3:+oo)
((t^2-(2*t)-15)/(t^2-9))/(t^2-(3*t)) = 0
((t^2-2*t-15)/(t^2-9))/(t^2-3*t) = 0
(t^2-2*t-15)/((t^2-9)*(t^2-3*t)) = 0
t^2-2*t-15 = 0
t^2-2*t-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
t = (64^(1/2)+2)/(1*2) or t = (2-64^(1/2))/(1*2)
t = 5 or t = -3
(t+3)*(t-5) = 0
t^2-3*t = 0
t*(t-3) = 0
t-3 = 0 // + 3
t = 3
t*(t-3) = 0
((t+3)*(t-5))/(t*(t^2-9)*(t-3)) = 0
( t+3 )
t+3 = 0 // - 3
t = -3
( t-5 )
t-5 = 0 // + 5
t = 5
t in { -3}
t = 5
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