\documentclass[10pt]{article}
\usepackage{makeidx}
\usepackage{multirow}
\usepackage{multicol}
\usepackage[dvipsnames,svgnames,table]{xcolor}
\usepackage{graphicx}
\usepackage{epstopdf}
\usepackage{ulem}
\usepackage{hyperref}
\usepackage{amsmath}
\usepackage{amssymb}
\author{R. Wacanno}
\title{}
\usepackage[paperwidth=595pt,paperheight=841pt,top=72pt,right=72pt,bottom=72pt,left=72pt]{geometry}

\makeatletter
	\newenvironment{indentation}[3]%
	{\par\setlength{\parindent}{#3}
	\setlength{\leftmargin}{#1}       \setlength{\rightmargin}{#2}%
	\advance\linewidth -\leftmargin       \advance\linewidth -\rightmargin%
	\advance\@totalleftmargin\leftmargin  \@setpar{{\@@par}}%
	\parshape 1\@totalleftmargin \linewidth\ignorespaces}{\par}%
\makeatother 

% new LaTeX commands


\begin{document}


{\raggedright
\textit{{\large $\theta{}$}$_{{\scriptsize n}}${\large (x}$_{{\scriptsize
n}}${\large )}$^{{\scriptsize 2}}$}
}

{\raggedright
\textit{{\large $\theta{}$}$_{{\scriptsize n}}${\large $\surd{}$(}{\large
x}$_{{\scriptsize n}}${\large )}}
}

{\raggedright
\textit{{\large $\theta{}$}$_{{\scriptsize 0}}$}
}

{\raggedright
\textit{{\large $\theta{}$}$_{{\scriptsize 0}}${\large x}$_{{\scriptsize 0}}$}
}

{\raggedright
\textit{{\large x}$_{{\scriptsize 0}}$}
}

{\raggedright
\textit{{\large h}$_{{\scriptsize $\theta{}$}}${\large (x) = }}{\large
\textbackslash sum\textbackslash limits\_\{i=0\}\textasciicircum{}n
}\textit{{\large $\theta{}$}$_{{\scriptsize i}}${\large x}$_{{\scriptsize i}}$}
}

{\raggedright
\textit{{\large h}$_{{\scriptsize $\theta{}$}}${\large (x) =
$\theta{}$}$_{{\scriptsize 0}}${\large x}$_{{\scriptsize 0}}${\large  +
$\theta{}$}$_{{\scriptsize 1}}${\large x}$_{{\scriptsize 1 }}${\large = }}{\large
\textbackslash sum\textbackslash limits\_\{i=0\}\textasciicircum{}1
}\textit{{\large $\theta{}$}$_{{\scriptsize i}}${\large x}$_{{\scriptsize i}}$}
}


\end{document}