| $$ \begin{aligned}3y^2-3x^2-e^xsiny+i(-6xy+e^xcosy+c)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}3y^2-3x^2-e^xsiny+i((-6x+e^xcos)y+c)\end{aligned} $$ | |
| ① | Use the distributive property. |