Mathematical functions

Hello,
 
is it possible to use mathematical functions in XQuery using a standardised library with a dedicated namespace ?
If not, what is the best way to use functions not defined in the built-in functions core library without defining them
into the XQuery itself ? Defining sin or tan using Taylor series may be very inefficient.
 
Best regards.
Stephane.
 
 
Stéphane
Mbaye
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