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diff --git a/complexfunctions.html b/complexfunctions.html
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--- a/complexfunctions.html
+++ b/complexfunctions.html
@@ -97,6 +97,7 @@ Graph complex functions (C->C)
<tr><td>pi</td> <td>$\pi = 3.14159265...$</td></tr>
<tr><td>e</td> <td>$e = 2.7182818...$</td></tr>
<tr><td>sqrt</td> <td>$\sqrt{x}$</td></tr>
+ <tr><td>abs</td> <td>$|x|$</td></tr>
<tr><td>exp</td> <td>$e^x$</td></tr>
<tr><td>sin</td> <td>Sine</td></tr>
<tr><td>cos</td> <td>Cosine</td></tr>