[xsl] Any difference between 1 div $x and math:pow($x, -1)?

["Roger L Costello costello@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hi Folks,

My XSLT program computes this expression many times for different values of
$x:

1 div (1 + math:exp(-$x))

Here is an equivalent expression:

math:pow(1 + math:exp(-$x), -1)

Which expression is better? By "better" I mean any one of these:

- produces more accurate results
- is faster
- is easier to understand, more intuitive

Or, are the two expressions equally good?

/Roger