OFFSET
1,2
LINKS
FORMULA
Equals Pi - arcsin(sqrt(7/2)/2) = Pi - arctan(sqrt(7)). - Amiram Eldar, Jul 09 2023
EXAMPLE
arccos(-sqrt(1/8)) = 1.93216345070...
MATHEMATICA
PROG
(PARI) acos(-sqrt(1/8)) \\ G. C. Greubel, Nov 18 2017
(Magma) [Arccos(-Sqrt(1/8))]; // G. C. Greubel, Nov 18 2017
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved