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D( t )
(t^2)/9 = 0
(t^2)/9 = 0
(t^2)/9 = 0
1/9*t^2 = 0 // : 1/9
t^2 = 0
t = 0
t in (-oo:0) U (0:+oo)
(200*t)/((t^2)/9) = 0
1800*t^-1 = 0 // : 1800
t^-1 = 0
t należy do O
t belongs to the empty set
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