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