[Nottingham] Trigonometry!

[Peter Chang]

On Sat, 27 Jan 2007, John Cremona wrote:
> just atan().   See "man atan2".
>
> atan2(x,y) is valid for all real x,y except 0,0 and gives the angle in

Not quite right there: atan2 is usually defined atan2(y,x) as noted in the 
aforementioned fine man-page.

Peter


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