[ww-bugs] Bug 4097: New: Missing density function in integrals confuses students

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=4097

           Summary: Missing density function in integrals confuses
                    students
           Product: Problem Libraries
           Version: unspecified
          Platform: PC
               URL: webwork-open-problem-library/OpenProblemLibrary/Alfred
                    Univ/anton8e/chapter15/15_6/prob2.pg
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Library (OPL)
        AssignedTo: gjennings at csudh.edu
        ReportedBy: jeremy.sylvestre at ualberta.ca
        Web browser ---
           version:


The integrals the student is asked to compute do not match the integrals in the
preamble. If the student computes the integrals as asked, the answers are
incorrect.

To fix, change lines 129--133 to the following

\(\displaystyle\int_c^d\int_{p(x)}^{q(x)}\delta(x,y)dydx = \) \{&ans_rule(30)\}
$BR
\(\displaystyle\int_c^d\int_{p(x)}^{q(x)}x\delta(x,y)dydx = \)
\{&ans_rule(30)\}
$BR
\(\displaystyle\int_c^d\int_{p(x)}^{q(x)}y\delta(x,y)dydx = \)
\{&ans_rule(30)\}

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