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