[ww-bugs] Bug 3701: New: rejects correct answer

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3701

           Summary: rejects correct answer
           Product: Problem Libraries
           Version: unspecified
          Platform: PC
               URL: Library/CollegeOfIdaho/setAlgebra_06_01_MultDivRationa
                    lExpressions/61IntAlg_22_MultDivRatExp.pg
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Library (OPL)
        AssignedTo: rcruz at collegeofidaho.edu
        ReportedBy: gjennings at csudh.edu
        Web browser ---
           version:


Library/CollegeOfIdaho/setAlgebra_06_01_MultDivRationalExpressions/61IntAlg_22_MultDivRatExp.pg

seed = 2996

rejects correct answer (x+3y)^2 with PG warning messages about empty answer
hash.
Changing the parentheses fixes the problem: it accepts [x+3y]^2 as a correct
answer with no warnings. 

Perhaps the problem could be fixed by commenting out these two lines 
                 map { s|^\(+|| } @student_factors;
                 map { s|\)+$|| } @student_factors;
in the code defining the custom answer evaluator RationalExpEvaluator in the
College of Idaho macros CofIdaho_macros.pl .  Eliminating leading and trailing
round parentheses with these two lines doesn't seem to accomplish anything in
this evaluator.

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