Graphics, Figures & Tables ⇒ Fitting a multirow tabular cell with rotated text

[Singularity]

I'm trying to get the "Degree" cell with the rotated text to expand to fit the text, but with no luck. I've tried \hspace, \vspace, and the following ~\hspace\baselineskip which I got from here.

I also tried using [origin=c], suggested here.

I've tried commenting out my parindent and parskip, but that wasn't it. So my code matches theirs exactly, yet "Degree" spills out of the box. What's different?

Code: Select all

\documentclass[fleqn,reqno]{article}
\usepackage{amsfonts,amsmath,amssymb,amsthm}

\usepackage{multirow}
\usepackage{graphicx}

\usepackage{array}		% Provides for a more flexible array and tabular environment
\usepackage{booktabs}	% For fancy stuff in arrays and tables, like the following column definitions
\newcolumntype{L}{>{\begin{math}}l<{\end{math}}}%
\newcolumntype{C}{>{\begin{math}}c<{\end{math}}}%
\newcolumntype{R}{>{\begin{math}}r<{\end{math}}}%

\setlength{\parindent}{0pt}
\setlength{\parskip}{\baselineskip}

\begin{document}

End behavior of polynomial functions

\begin{tabular}{|c|c|c|c|l|}
	\cline{3-5}
	\multicolumn{2}{c|}{}   & \multicolumn{2}{c|}{\textbf{\underline{Lead Coefficient}}} & \\
	\multicolumn{2}{c|}{}   & Positive & Negative & Notes\\
	\hline
	\multirow{2}{*}{\rotatebox[origin=c]{90}{\textbf{Degree~\hspace{-\normalbaselineskip}}}}
	             & Even     & up/up    & down/down & \textbf{Even} degree's ends always go in the \textbf{same} direction. \\
	             &  Odd     & down/up  & up/down   & \textbf{Odd} degree's ends always go in the \textbf{opposite} direction. \\
	\hline
\end{tabular}
\end{document}