h5p math latex

Hello! I was so glad to see the release of math formulas in h5p. Thank you very much.

I had installed the library for it. I had learned the basics of latex.

But I don't understand where and how should I use latex "code".

When I insert it into the h5p editor in the process of content creation it is not shown right on the page

 1)I create latex code in the editor with all the commands like \documentclass[a4paper,12pt]{article}

or just for the formula 

(like \begin{equation}\label{eq:fourierrow}

f(x) = \frac{A_0}{2} + \sum \limits_{n=1}^{\infty} A_n \cos \left( \frac{2 n \pi x}{\nu} - \alpha_n \right) 

\end{equation})

 2)I create contenet "fill in the blanks" or drag and drop types on my Drupal7 site page on the page with the url

node/add/h5p-content

3)In the task desription page block I insert all the code from the editor or its part

But it is nt working

See screenshoots.

E.g. I had created the code

"

\documentclass[a4paper,12pt]{article}

\usepackage{cmap}

\usepackage[T2A]{fontenc}

\usepackage[utf8]{inputenc}

\usepackage[english]{babel}

\begin{document}

\maketitle

\begin{equation}\label{eq:fourierrow}

f(x) = \frac{A_0}{2} + \sum \limits_{n=1}^{\infty} A_n \cos \left( \frac{2 n \pi x}{\nu} - \alpha_n \right) 

\end{equation}

\end{document}

"

Where should I insert this code?