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Re: Sine and Cosine Accuracy

From: David Daney <ddaney at avtrex dot com>
To: Dave Korn <dave dot korn at artimi dot com>
Cc: 'Scott Robert Ladd' <scott dot ladd at coyotegulch dot com>, 'Paul Koning' <pkoning at equallogic dot com>, rth at redhat dot com, gcc at gcc dot gnu dot org
Date: Thu, 26 May 2005 10:22:52 -0700
Subject: Re: Sine and Cosine Accuracy
References: <SERRANOiVklUVhjNIjm00000179@SERRANO.CAM.ARTIMI.COM>

Dave Korn wrote:

" Identities such as
            sin(x)^2 + cos(x)^2 === 1
  are only valid when 0 <= x <= 2*PI"

It's been a while since I studied math, but isn't that particular identity is true for any x real or complex?

David Daney,

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