arccos function

"Vavrek, Zachary Munson" <[email protected]>
Newsgroups gmane.text.xml.xslt.extensions
Message-ID <[email protected]>
hello, i need a function that returns the arccos of a number. i dont have 
math modules or whatever on my xmlspy. can u tell me what i need to download 
or if i can just get the function. i just dont know what to do, any help 
will be great. thank u

zac
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