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<quiz>
  <question type="description">
    <name>
      <text>25.4.1.4</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[<h4 class="HELM_example">Example</h4>
<p>Write down the solutions for \(X\), for \(Y\) and hence the product solution \(u(x,y)=X(x)Y(y)\):</p>
<h4 class="HELM_solution">Solution</h4>

<table width="80%">
    <tbody>
        <tr>
            <td>\(X=A\cos \lambda x +B\sin \lambda x\)</td>
            <td>\(Y=Ce^{\lambda y}+D e^{-\lambda y}\)</td>
        </tr>
    </tbody>
</table>

so

<table width="100%">
    <tbody>
        <tr>
            <td>\(\qquad u=(A\cos \lambda x +B\sin \lambda x)(Ce^{\lambda y}+D e^{-\lambda y})\)</td>
            <td>\[(4)\]</td>
        </tr>
    </tbody>
</table>]]></text>
    </questiontext>
    <generalfeedback format="html">
      <text/>
    </generalfeedback>
    <defaultgrade>0</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <idnumber/>
  </question>
</quiz>
