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D( t )
t-2 = 0
t^2 = 0
t-2 = 0
t-2 = 0
t-2 = 0 // + 2
t = 2
t^2 = 0
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t in (-oo:0) U (0:2) U (2:+oo)
(((3*t)/(t-2))*(3*t-6))/(t^2) = 0
(3*t*(3*t-6))/(t^2*(t-2)) = 0
( 3*t-6 )
3*t-6 = 0 // + 6
3*t = 6 // : 3
t = 6/3
t = 2
( 3*t )
3*t = 0 // : 3
t = 0
t in { 2}
t in { 0}
t belongs to the empty set
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