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D( t )
t^3-(2*t^2) = 0
t^3-(2*t^2) = 0
t^3-(2*t^2) = 0
t^3-2*t^2 = 0
t^3-2*t^2 = 0
t^2*(t-2) = 0
t-2 = 0 // + 2
t = 2
t^2 = 0
1*t^2 = 0 // : 1
t^2 = 0
t = 0
t in (-oo:0) U (0:2) U (2:+oo)
(5*t^4-(10*t^3))/(t^3-(2*t^2)) = 0
(5*t^4-10*t^3)/(t^3-2*t^2) = 0
5*t^4-10*t^3 = 0
5*t^3*(t-2) = 0
t-2 = 0 // + 2
t = 2
5*t^3*(t-2) = 0
t^3-2*t^2 = 0
t^2*(t-2) = 0
t-2 = 0 // + 2
t = 2
t^2*(t-2) = 0
(5*t^3*(t-2))/(t^2*(t-2)) = 0
( 5*t^3 )
5*t^3 = 0 // : 5
t^3 = 0
t = 0
( t-2 )
t-2 = 0 // + 2
t = 2
t in { 0}
t in { 2}
t belongs to the empty set
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