Question
Answer
$$(-i)\cdot2i(-\dfrac{1}{8}i)^3=2(-\dfrac{1}{8}i)^3$$
Explanation
| $$ \begin{aligned}(-i)\cdot2i(-\frac{1}{8}i)^3& \xlongequal{ }-2i^2(-\frac{1}{8}i)^3 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2(-\frac{1}{8}i)^3\end{aligned} $$ | |
| ① | $$ -2i^2 = -2 \cdot (-1) = 2 $$ |
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