| $$ \begin{aligned}2i^8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2\end{aligned} $$ | |
| ① | $$ 2i^8 = 2 \cdot i^{4 \cdot 2 + 0} =
2 \cdot \left( i^4 \right)^{ 2 } \cdot i^0 =
2 \cdot 1^{ 2 } \cdot 1 =
2 \cdot 1 $$ |