[Openroad-users] Reverse Cosine

[Robert Allely]

Great ! Yes arctan is in the manual. This should work within float8.
I was trying to avoid using tan as it can have high values for certain
angles.

Thanks Karl 

-----Original Message-----
From: openroad-users-bounces at peerlessit.com
[mailto:openroad-users-bounces at peerlessit.com] On Behalf Of Karl & Betty
Schendel
Sent: Tuesday, 1 May 2007 1:45 p.m.
To: International OpenROAD Users
Subject: Re: [Openroad-users] Reverse Cosine

At 11:31 AM +1200 5/1/07, Robert Allely wrote:
>
>Hullo - does anyone know if reverse cosine can be calculated in ingres/
OpenROAD? Ie. Cos (:radians) is known, find :radians?
>

I think there's an arctan function, and you can get arccos from it with
the formula
arccos(x) = arctan(sqrt( (1-x^2)/x))

Karl
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