<htmlfilename="78d7d3642f3a4dbabbd1b017861aa5f2"display_name="Lesson 2: Let's Get Interactive!"source_code="\subsection{Example of E-text in LaTeX} It is very convenient to write complex equations in LaTeX. \begin{equation} x = \frac{-b\pm\sqrt{b^2-4*a*c}}{2a} \end{equation} Seize the moment. "/>