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t in (-oo:+oo)
4*e^((1/2)*t) = 0
e^((1/2)*t) = 0
t należy do O
4*e^((1/2)*t) = 0 <=> 4 = 0 or 4*e^((1/2)*t) = 0 <=> e^((1/2)*t) = 0
t belongs to the empty set
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