\input epsf
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\noindent {\bf Problem statement} Use appropriate trig substitutions to evaluate:

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\settabs 3 \columns
\+a)$\displaystyle{\int  \sqrt{4-x^2} \,dx}$
&b) $\displaystyle{\int  \sqrt{4+x^2} \, dx}$  
&c) $\displaystyle{\int  \sqrt{5+2x+x^2} \, dx}$\cr

\vfil\eject\end