From: Andrew Hurrell <andrew AT acoustics DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Inverse Cos
Date: Tue, 02 Sep 1997 16:59:28 +0100
Organization: Precision Acoustics Ltd
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Jason D. Chu wrote:
> 
> I know about cos(), acos(), and cosh().  But where is Inverse Cos?

acos() is, as far as my understanding goes, inverse cos().  acos()
implements Arccos which is an inverse operation just like Arctan is an
inverse of tan.  NB. inverse trig functions are periodic and not single
valued, just like the standard trig functions.

Hope this helps

Andrew 
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