\documentclass[a4paper,12pt]{article}
\usepackage{epsfig}
\newcommand{\ds}{\displaystyle}
\newcommand{\pl}{\partial}
\parindent=0pt
\begin{document}


{\bf Question}

Let $X$ be the plane region lying between the positive real axis
and imaginary axis and the \lq \lq positive " branch of the
hyperbola $xy=1.$

Sketch the regoins $$iX = \{iz|\epsilon X\}; \, \, \bar{X} =
\{\bar{z}|\epsilon X\} ; \,\,\, X^2 = \{z^2|z\epsilon X\}.$$

\vspace{.25in}

{\bf Answer}

\begin{center}
$\begin{array}{cccc}
\epsfig{file=cn-12-1.eps, width=23mm} \ & \
\epsfig{file=cn-12-2.eps, width=23mm} \ & \
\epsfig{file=cn-12-3.eps, width=23mm} \ & \
\epsfig{file=cn-12-4.eps, width=23mm}\\
X & iX & \overline{X} & X^2
\end{array}$
\end{center} 



\end{document}