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\documentclass[12pt]{article}
\title{cmpe220 hw \#2}
\author{Your Name}
\date{\today}

\begin{document}
\maketitle

\begin{enumerate}

\item 
Let $R_{1}$ and $R_{2}$ be relations from $S$ to $T$.
Prove or disprove that 
\[
(R_{1} \cup R_{2})^{-1} = R_{1}^{-1} \cup R_{2}^{-1}.
\]

\item 
What can you say about 
$2^{A} \cup 2^{B}$ 
and 
$2^{A \cup B}$?
Give justification.

\end{enumerate}

\end{document}