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D( t )
ln(3*t) = 0
3*t <= 0
ln(3*t) = 0
ln(3*t) = 0
ln(3*t) = ln(e^0)
3*t = e^0
3*t-e^0 = 0
3*t-1 = 0 // + 1
3*t = 1 // : 3
t = 1/3
3*t <= 0
3*t <= 0
3*t+0 <= 0 // - 0
3*t <= 0 // : 3
t <= 0/3
t <= 0
t in (0:1/3) U (1/3:+oo)
614/ln(3*t) = 0
t_1 = ln(3*t)
614/t_1 = 0
614*t_1^-1 = 0 // : 614
t_1^-1 = 0
t_1 należy do O
t belongs to the empty set
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