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\begin{exer}
\end{exer}

\begin{instructions} In Exercises~\ref{2.nformst}  and~\ref{2.nformend
+} ,
given the function $\phi$, place the ordinary differential equation
...
\end{soln}
\begin{answer}\exfig{ex2.1ans01}\end{answer}
\end{exer}