[ww-bugs] Bug 3605: New: correct answer rejected

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3605

           Summary: correct answer rejected
           Product: Problem Libraries
           Version: unspecified
          Platform: PC
        OS/Version: Mac OS
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Library (OPL)
        AssignedTo: jj at asu.edu
        ReportedBy: Dick.Lane at umontana.edu
        Web browser ---
           version:


Library/Michigan/Chap7Sec4/Q19.pg

with seed 651, student answer
    x^2/3+2ln|(x+1)|-2ln|(x+5)|+C
and my rewrite
    x^2/3 + 2 ln(|x+1|) - 2 ln(|x+5|) + C
are rejected as correct, but problem displays
   
\frac{x^{3}}{3}+2\ln\!\left(\left|x+1\right|\right)-2\ln\!\left(\left|x+5\right|\right)+C
as correct answer (it matches solution's last line)

I do not see an obvious source of the mistake in answer checking.
Since expression for $ans ends with reduce(), I see no need to parenthesize $s1
or $s2 in it.

dick

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