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D( t )
-3*1.05^10 = 0
-3*1.05^10 = 0
-3*1.05^10 = 0
-3*1.05^10 = 0
t belongs to the empty set
t in (-oo:+oo)
1.43*e^(-t/(-3*1.05^10)) = 0
e^(-t/(-3*1.05^10)) = 0
t należy do O
1.43*e^(-t/(-3*1.05^10)) = 0 <=> 1.43 = 0 or 1.43*e^(-t/(-3*1.05^10)) = 0 <=> e^(-t/(-3*1.05^10)) = 0
t belongs to the empty set
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