Answer
$-1$
Work Step by Step
Using $i^2=-1$ and the laws of exponents, the given expression, $
i^{38}
,$ is equivalent to
\begin{array}{l}\require{cancel}
\left( i^2 \right)^{19}
\\\\=
\left( -1 \right)^{19}
\\\\=
-1
\end{array}
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