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Re: Programming Trig Functions

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

In article <8i9ppe$2js at>,
 dehartre at (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.


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 Research, Inc.
Disclaimer: Opinions expressed herein are those of the author alone.

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