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This commit implements the .tex-based online help system in LON-CAPA. It
may be necessary to manually run loncom/build/help_graphics_converter.pl
and doc/help/rebuildLabelHash.pl after a cvs update, and
loncapa_apache.conf may need to be manually copied to /etc. (The
loncapafiles.lpml has been updated.)

After merging this, the URL http://[loncapahost]/adm/help/Foils.hlp
should display a help file.

Also, some *very* out-of-date files have been removed from the /doc
directory.

\index{Formula Response}\label{Formula Response}

%
\begin{figure}
\begin{center}\includegraphics[  width=0.80\paperwidth]{formulaResponse}\end{center}


\caption{Formula Response Problem}
\end{figure}
Formula response problems asks the student to type in a formula as an answer.
If the answer is $2x^{2}+4$, the student is allowed to type {}``2{*}x{*}x+4'',
{}``x{*}x + x{*}x + 4'', {}``2{*}x\textasciicircum{}2 + 14 - 10'', or
any other equivalent expression. Formula Response problems have many of the
same characteristics of Numerical Response problems, including the ability
to run scripts, dynamically generate answers, etc.