Produce your first Arabic document with Latex!

The first line of the input file should normally be like:
\documentclass[a4paper,12pt]{article}
We can change the commend article with letter or book, but here we will employ arabart:
\documentclass[a4paper,12pt]{arabart}
If one merly wishes to type in ordinary text, without complicated mathematical formulae or special effects, then one merly can use the command article and type it in as it is. However, arabart has to be applied to avoid errors when Arabic characters are mixed with the Latin ones.
 Here is an exemple of a typical Arab Latex input file with the pdf result:

As you can  see, this is an exercice of mathematic writed in arabic with formulae in the usual Latin:

\documentclass[11pt,a4paper]{arabart}

\usepackage[utf8]{inputenc}

\usepackage[LAE]{fontenc}

\usepackage[arabic]{babel}

\begin{document}

    تمرين  
 \\
    
     نعتبر الدالة العددية $f$ للمتغير الحقيقي $x$ المعرفة ب:

 $ f(x)=\displaystyle\frac{-x^2-x+6}{x^2+2x-8}$
 \\
 $1$)
 حدد
 $D_f$
 و احسب نهايات 
 $f$
 عند محدات 
 $D_f$.\\
 $2$)
 ادرس اتصال $f$ 
 على
  $D_f$.\\
$3$)
هل الدالة 
$f$
تقبل تمديدا بالإتصال في
$2$
؟
في
$-4$
؟

\end{document}

And if you want to visualize it at writelatex