Path: utzoo!attcan!uunet!wuarchive!mit-eddie!rutgers!netnews.upenn.edu!sequoia!hoford
From: hoford@sequoia.upenn.edu (John Hoford)
Newsgroups: comp.sys.handhelds
Subject: Re: A strange feature (a bug?)
Keywords: symbolic integration/differentation in DEG mode
Message-ID: <30926@netnews.upenn.edu>
Date: 10 Oct 90 17:24:46 GMT
References: <1990Oct10.093506.8848@wuarchive.wustl.edu> <15930@shlump.nac.dec.com> <1990Oct10.152505.2903@wuarchive.wustl.edu>
Sender: news@netnews.upenn.edu
Organization: CIRC,Radiology,U. of Pennsylvania
Lines: 44

In article <1990Oct10.152505.2903@wuarchive.wustl.edu> hp48sx@wuarchive.wustl.edu (HP48SX Archive Maintainer) writes:
>In article <15930@shlump.nac.dec.com> edp@jareth.enet.dec.com (Eric Postpischi
>60 degress = pi/3 radians. This is a FACT!
>thus  sin( 60deg ) = sin( pi/3 RAD )
>these two point are exactly at the same point on the curve, and thus
>the derivative must also be the same. 
>

but the x axis has been scaled by a factor of 180/pi so the derivative (dy/dx)
must be also scaled



grap of sin(x) in rad
                            |
                            |     *  *  *
                            |  *          * 
                            |*              *
	-------------------*-----------------------
       -3.14             *  0                    3.14
            *          *    
              *  *  *  

at a point say x = 0 slope moves about 1 y unit for every 1 x unit 
hence slope is (dy/dx) 1/1 = 1.




grap of sin(x) in rad
                            |
                            |     *  *  *
                            |  *          * 
                            |*              *
	-------------------*-----------------------
        -180             *  0                    180
            *          *    
              *  *  *  

at a point say x = 0 slope moves about 1 y unit for every (180/pi) x unit 
hence slope is (dy/dx) 1/(180/pi) = 1 * pi/180.


John D. Hoford