OFFSET
1,2
FORMULA
Equals arcsech((1/8)*(4 - 4*sqrt(2) - 9*sqrt(5 + 4*sqrt(2)) + (5 + 4*sqrt(2))^(3/2))).
EXAMPLE
x = 1.3901482723111926878385795316101750496233667106...
MATHEMATICA
Solve[1/Sinh[x] + 1/Cosh[x] == 1, x]
Plot[1/Sinh[x] + 1/Cosh[x] - 1, {x, -3, 3}]
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Jan 02 2020
STATUS
approved