I am attempting to place some text/equations/table within a minibox next to a figure. I was following the example solution given here. When I try to do a page break I get a compile error. This is what I get with the current code:
I would like to fit the equations within the red box via a page break or any other means.
Is there a simpler solution available?
CODE
\documentclass{article}
\usepackage[landscape]{geometry}
\usepackage[table]{xcolor}
\usepackage{mathtools}
\usepackage{multicol}
\usepackage{amssymb,amsthm}
\usepackage{tikz}
\usetikzlibrary{tikzmark, quotes, decorations.pathmorphing, shapes, arrows.meta, positioning, calc}
\usepackage[most]{tcolorbox}
\usepackage{float}
\usepackage{graphicx}
%======================================================================================
% FOR TEXTBOX
%======================================================================================
\usepackage[pscoord]{eso-pic}
\newcommand{\placetextbox}[3]{% \placetextbox{<horizontal pos>}{<vertical pos>}{<stuff>}
\setbox0=\hbox{#3}% Put <stuff> in a box
\AddToShipoutPictureFG*
{\put(\LenToUnit{#1\paperwidth},\LenToUnit{#2\paperheight}){\makebox[0pt][c]{\begin{tabular}{l}#3\end{tabular}}}}
}%
\advance\topmargin-1in
\advance\textheight3in
\advance\textwidth3in
\advance\oddsidemargin-1.5in
\advance\evensidemargin-1.5in
\parindent0pt
\parskip2pt
\newcommand{\hr}{\centerline{\rule{3.5in}{1pt}}}
\begin{document}
\begin{multicols*}{3}
\newtcolorbox{mybox}[2][]{text width=0.97\textwidth,fontupper=\scriptsize,
fonttitle=\bfseries\sffamily\scriptsize, colbacktitle=black,enhanced,
attach boxed title to top left={yshift=-2mm,xshift=3mm},
boxed title style={sharp corners},top=3pt,bottom=2pt,
title=#2,colback=white}
%-------------------SECOND ORDER SYSTEM-----------------------------------
\begin{minipage}{0.33\textwidth}
\begin{mybox}{Second Order System}
$\dfrac{C(s)}{R(s)} =\dfrac{\omega^{2}_{n}}{s^{2}+2\zeta\omega_{n}s+\omega^{2}_{n}},$
$\omega_{n}=$ natural frequency, $\zeta=$ damping coefficient(ratio).
\hspace*{6cm}$s_{1,2}=-\zeta\omega_{n}\pm\omega_{n}\sqrt{\zeta^{2}-1}$
\vspace*{-0.4cm}
\begin{figure}[H]
\begin{flushleft}
\includegraphics[width=5cm, height=3cm]{example-image-b}
\end{flushleft}
\end{figure}
\placetextbox{0.4}{.9}{
\scriptsize{
Step Response: $C(s) =\dfrac{\omega^{2}_{n}}{s(s^{2}+2\zeta\omega_{n}s+\omega^{2}_{n})},$
$c(t)=1-\dfrac{1}{\sqrt{1-\zeta^{2}}}e^{-\zeta\omega_{n}t}\cos\left(\omega_{n}\sqrt{1-\zeta^{2}}t-\tan^{-1}\left(\zeta/\sqrt{1-\zeta^{2}}\right)\right)$}}
\end{mybox}
\end{minipage}
\end{multicols*}
\end{document}


Step Response: \\$C(s) =\dfrac{\omega^{2}_{n}}{s(s^{2}+2\zeta\omega_{n}s+\omega^{2}_{n})},$\\,' I get the errorMissing } inserted...l.371 \end{multicols*}` How can I break up the lines without the error? – Joe Oct 20 '18 at 22:06amsmath,mathtools,nccmathor other packages. for start search for example of usegather,alignenvironments or questions tagged withamsmathormathtools. – Zarko Oct 20 '18 at 22:51\\does not work for me? Thanks. – Joe Oct 21 '18 at 02:17