| $$ \begin{aligned}\frac{2+i}{1-i}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{1+3i}{2}\end{aligned} $$ | |
| ① | Divide $ \, 2+i \, $ by $ \, 1-i \, $ to get $\,\, \dfrac{1+3i}{2} $. ( view steps ) |