Inverse trigonometric ratios (arcsin, arccos, arctan, etc.)

[darklich14]

I am calculating the distance in nautical miles between two lat and lon coordinates on the globe. The formula calls for the arccos of a bunch of things and I am unable to find an arccos function in the math library. Does anyone know of a way around this or if there is an arccos function but I'm looking in the wrong place? I'm using version 8.5 to narrow things down for anyone who thinks they might have an answer.
Thanks in advance!
-darklich14

 

[chelseatech]

From memory, all the arccos, arcsin, etc functions can be calculated from arctan. From the Vb help files...
Arcsin(X) = Atn(X / Sqr(-X * X + 1)) and
Arccos(X) = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1)

And atn is available in Cr8.5 Editor and Publisher of Crystal Clear

http://www.chelseatech.co.nz/pubs.htm

 

[dgillz]

There is a UFL available on the crystal decisions website that has several trigonometric functions, I am not sure is the ones you mentioned are included. You might check this out though. Software Sales, Training and Support for Macola, Crystal Reports and Goldmine
dgilsdorf@mchsi.com

 

[synapsevampire]

Here's the list of UFLs available, and there is a UFL with what you seek:

http://support.crystaldecisions.com/communityCS/TechnicalPapers/cr_ufls.pdf

-k

http://www.informeddatadecisions.com

kai@informeddatadecisions.com