The Museum of HP Calculators
HP Forum Archive 15
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Message #1 Posted by Goober on 25 Apr 2005, 7:58 p.m.
I cant remember how to evaluate Arccosh on my HP. Can somebody help.
Message #2 Posted by Thomas Okken on 25 Apr 2005, 8:32 p.m.,
in response to message #1 by Goober
It depends... Do you know if your HP has a built-in acosh function? If not, use acosh(x)=ln(x+sqrt(x^2-1)).
If it does, or if you're not sure, let us know what model you have and I'm sure someone can help you out. (In case you have an HP-42S, the ACOSH function is not in any menu (other than the FCN catalog); I recommend to use ASSIGN to assign it to a CUSTOM menu key if you have to use it frequently.)
Edited: 25 Apr 2005, 8:34 p.m.
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