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D( t )
t^3 = 0
t^3 = 0
t^3 = 0
1*t^3 = 0 // : 1
t^3 = 0
t = 0
t in (-oo:0) U (0:+oo)
54/(t^3) = 0
54*t^-3 = 0 // : 54
t^-3 = 0
t należy do O
t belongs to the empty set
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