Inverse cosine isn't built in but can be derived from atan()
This is covered in Chapter 8 of Lingo in a Nutshell. If you don't own LiaN,
you can download what you need from:
http://www.zeusprod.com/nutshell/chapters/lian08.html
>Is there an inverse cosine function in lingo?
>I've looked and didn't find it.
>
>Anyone enough of a mathwiz to tell me how to calculate it if there's no such
>function available?
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