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