Answer
$$2i^9=2i$$
Explanation
| $$ \begin{aligned}2i^9& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2i\end{aligned} $$ | |
| ① | $$ 2i^9 = 2 \cdot i^{4 \cdot 2 + 1} =
2 \cdot \left( i^4 \right)^{ 2 } \cdot i^1 =
2 \cdot 1^{ 2 } \cdot i =
2 \cdot i $$ |
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