--- loncom/xml/lontexconvert.pm	2005/02/24 09:06:14	1.50
+++ loncom/xml/lontexconvert.pm	2005/02/24 09:54:01	1.55
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.50 2005/02/24 09:06:14 albertel Exp $
+# $Id: lontexconvert.pm,v 1.55 2005/02/24 09:54:01 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -249,10 +249,31 @@ sub postprocess_algebra {
     my ($string)=@_;
     
     # moodle had these and I don't know why, ignoring them for now
-    # $string =~/\\left\{/\{/g;
-    # $string =~/\\right\}/\}/g;
-    # $string =~/\\fun/ /g;
+    # $string =~s/\\fun/ /g;
 
+    # sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying
+    $string =~s/\\left\{/\{/g;
+    $string =~s/\\right\}/\}/g;
+
+    # remove the extra () in the denominator of a \frac
+    $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
+    
+    # sqrt(3,4) means the 4 root of 3
+    $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
+
+    # log(3,4) means the log base 4 of 3
+    $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
+
+    # log(3,4) means the log base 4 of 3
+    $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
+
+    # int(3,a,b) integral from a to b of 3
+    $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
+
+    # int( ... dx) -> ...
+    $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
+
+    &Apache::lonnet::logthis($string);
     return $string;
 }
 1;