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D( t )
5*t = 0
5*t = 0
5*t = 0
5*t = 0 // : 5
t = 0
t in (-oo:0) U (0:+oo)
1/(5*t) = 0
1/5*t^-1 = 0 // : 1/5
t^-1 = 0
t należy do O
t belongs to the empty set
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