OFFSET
0,1
EXAMPLE
arclength = 0.780131428280849333559981872217733063687522...
MATHEMATICA
s = Integrate[Sqrt[1 + D[Tan[x], x]^2], {x, 0, Pi/6}]
r = N[s, 200]
RealDigits[r][[1]]
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Jun 15 2020
STATUS
approved