ln()</code></li><li><strong>Constants</strong>: <code>pi</code>, <code>e</code></li></ul><h3>Complex Calculation Example</h3><pre>
Radius: 5

```button
name Calculate Circle Area
type calculate
action pi * ($1^2)
```
^button-circle-area
</pre><h2>Line Reference Tips</h2><ol><li><strong>Line counting</strong>: Lines are counted from the top of the note, starting with 1</li><li><strong>Multiple numbers</strong>: If a line has multiple numbers, it uses the first one</li><li><strong>Decimal numbers</strong>: Bo