OFFSET
1,2
FORMULA
Equals arcsin(2*sqrt(6)/5) = arccos(1/5) = arctan(2*sqrt(6)). - Amiram Eldar, May 24 2021
EXAMPLE
arcsec(5) = 1.3694384060045658277761961394221280318585...
MATHEMATICA
(See A195769.)
RealDigits[ArcSec[5], 10, 120][[1]] (* Harvey P. Dale, Aug 27 2023 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 24 2011
STATUS
approved