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Re: Programming Trig Functions

• To: mathgroup at smc.vnet.net
• Subject: [mg23923] Re: Programming Trig Functions
• From: paulh at wolfram.com (P.J. Hinton)
• Date: Fri, 16 Jun 2000 00:57:03 -0400 (EDT)
• Organization: "Wolfram Research, Inc."
• References: <8i9ppe$2js@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In article <8i9ppe$2js at smc.vnet.net>,
 dehartre at hotmail.com (BeckyD) writes:

> I am writing a program and I need to convert the ArcCosign from
> radians to degrees.  I have this formula: ArcCos =
> ArcTan(Sqrt(1-x*x)/x)*180/pi, but it won't work with negative numbers.

See;

http://mathworld.wolfram.com/InverseCosine.html

There you will find a relation between the inverse cosine and 
inverse tangent that is valid for both positive and negative
values of x.

-- 
P.J. Hinton
Mathematica Programming Group           paulh at wolfram.com
Wolfram Research, Inc.
Disclaimer: Opinions expressed herein are those of the author alone.