Answer
$$ i+4k.$$
Work Step by Step
$$
\lim _{t \rightarrow 0} e^{ 2t} i+\ln( t+1)j+ 4 k=
\lim _{t \rightarrow 0} e^{ 2t} i+\lim _{t \rightarrow 0} \ln( t+1)j+\lim _{t \rightarrow 0} 4 k\\=i+0j+4k=i+4k.
$$
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