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<h3>ln() function</h3>
Returns the value of the natural logarithm of the passed expression.
<br>
This function takes one argument.
<h4>Syntax</h4>
<code>ln(value)</code><br>
<h4>Arguments</h4>
<code>value</code> - any positive number.
<br>
<h4>Example</h4>
<!-- Show example of function.-->
<code>ln(1) &rarr; 0</code><br>
<code>ln(e) &rarr; 1</code><br>