$$ \begin{aligned}i^5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}i\end{aligned} $$ | |
① | $$ i^5 = i^{4 \cdot 1 + 1} =
\left( i^4 \right)^{ 1 } \cdot i^1 =
1^{ 1 } \cdot i =
i $$ |