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    Re: from a watcher
    From: Dan Allen
    Date: 2002 Oct 17, 18:57 -0700

    On Thursday, October 17, 2002, at 06:52 PM, Dan Allen wrote:
    >
    >   cos(c) = cos(a)*cos(b) + sin(a)*cos(b)cos(ab)
    >
    > I did it by memory! ;-)
    
    Arrgggghhh!  I did it by memory and of course I typed it in wrong!!
    How embarrasing.
    
       cos(c) = cos(a)*cos(b) + sin(a)*sin(b)*cos(ab)
    
    is more like it.
    
    That's why I like to get it programmed in a calculator, tested,
    and then I can rely upon it rather than my fallible memory and hands.
    
    Dan
    
    
    

       
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