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      <text>18.1.1.4 Function of Three Variables</text>
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      <text><![CDATA[<p>In a similar way we can define a function of three independent variables. Let these variables be \(x,y\) and \(u\) and the function \(f(x,y,u)\).</p>
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<h4 class="HELM_example">Example</h4>
<p>Given \(f(x,y,u)=x^2+yu+2\), find \(f(0,1,0),\ f(-1,-1,2)\).</p>

<h4 class="HELM_solution">Solution</h4>
\(f(0,1,0)=0^2+1\times 0+2=2\), &nbsp;\( f(-1,-1,2)=1-2+2=1\)]]></text>
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