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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
6 = 6-(4/t) // - 6-(4/t)
4/t-6+6 = 0
4*t^-1 = 0 // : 4
t^-1 = 0
t należy do O
t belongs to the empty set
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