\input epsf
\nopagenumbers
\magnification=\magstep1

\noindent {\bf Problem statement} Find a solution of $\displaystyle
y'={y\over{1-x^2}}$ which passes through $(0,1)$. Write the solution
explicitly as $y=f(x)$. Graph the solution curve. What is the domain
of the function describing the solution curve?

\vfil\eject\end