--- loncom/homework/default_homework.lcpm	2006/06/13 14:57:54	1.107
+++ loncom/homework/default_homework.lcpm	2006/06/30 21:24:27	1.108
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.107 2006/06/13 14:57:54 albertel Exp $
+# $Id: default_homework.lcpm,v 1.108 2006/06/30 21:24:27 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -152,9 +152,9 @@ sub caparesponse_check {
     my $reterror="";
     my $result;
     if ($type eq '9') {
-      $result = &maxima_check($response,$answer,\$reterror);
+      $result = &maxima_check(&maxima_cas_formula_fix($response),&maxima_cas_formula_fix($answer),\$reterror);
     } else {
-       $result = &caparesponse_capa_check_answer($response,$answer,$type,
+       $result = &caparesponse_capa_check_answer(&capa_formula_fix($response),&capa_formula_fix($answer),$type,
 						 $tol_type,$tol,
 						 $sig_lbound,$sig_ubound,
 						 $ans_fmt,$unit,$calc,$id_list,
@@ -184,6 +184,23 @@ sub caparesponse_check {
     return ("$result:\nRetError $reterror:\nAnswer $answer:\nResponse $response:\n type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|\n$message",$reterror);
 }
 
+sub maxima_cas_formula_fix {
+   my ($expression)=@_;
+   return &implicit_multiplication($expression);
+}
+
+sub capa_formula_fix {
+   my ($expression)=@_;
+   return &implicit_multiplication($expression);
+}
+
+sub implicit_multiplication {
+    my ($expression)=@_;
+    $expression=~s/\s+/\*/g;
+    $expression=~s/(\d)([a-zA-Z\(])/$1\*$2/g;
+    $expression=~s/\)(\w)/\)\*$1/g;
+    return $expression;
+}
 
 sub caparesponse_check_list {
     my $response=$LONCAPA::CAPAresponse_args{'response'};