# [LON-CAPA-users] algebra tag for nice formula output

**Stefan Bisitz
**
lon-capa-users@mail.lon-capa.org

*Fri, 04 Feb 2011 19:20:14 +0100*

[sent: 04.02.2011, 19:20 CET]
Hi authors,
I'd like to randomize the variables in a formula which is created in the
problem's script block. The formula is used in the answer block as well
as in the text where a nice formula rendering output is wanted. This is
done by using the <algebra> tag.
The <m> tag would be also possible and works fine, but the screen output
isn't so nice for fractions. <algebra> behaves a bit strange. Bug or
wrong usage or something else I'm missing?
Simplified problem source code:
---- Start ----
<problem>
<script type="loncapa/perl">
$x = "x";
$f = "f($x) = 1 / (g($x) + h($x))";
</script>
<startouttext />
<algebra>$f</algebra>
<br />
<m eval="on">$ $f $</m>
<endouttext />
</problem>
---- End ----
Output with tth rendering (similar with mimetex):
[(f x=1)/(g x+h x)]
f(x) = 1 / (g(x) + h(x))
Thanks for any hints,
Stefan Bisitz