A019895 Decimal expansion of sine of 86 degrees.

9, 9, 7, 5, 6, 4, 0, 5, 0, 2, 5, 9, 8, 2, 4, 2, 4, 7, 6, 1, 3, 1, 6, 2, 6, 8, 0, 6, 4, 4, 2, 5, 5, 0, 2, 6, 3, 6, 9, 3, 7, 7, 6, 6, 0, 3, 8, 4, 2, 2, 1, 5, 3, 6, 2, 2, 5, 9, 9, 5, 6, 0, 8, 8, 9, 8, 2, 1, 9, 1, 8, 1, 4, 1, 1, 0, 8, 1, 8, 4, 3, 0, 8, 5, 2, 8, 9, 2, 1, 1, 6, 7, 5, 4, 7, 6, 0, 3, 7

Offset

0,1

Links

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Index entries for algebraic numbers, degree 12.

Formula

Equals cos(Pi/45) = 2F1(8/15,7/15;1/2;3/4) / 2. - R. J. Mathar, Oct 27 2008

Equals 2*A019852*A019856. - R. J. Mathar, Jan 17 2021

Minimal polynomial 4096*x^12 -12288*x^10 +512*x^9 +13824*x^8 -1152*x^7 -7168*x^6 +864*x^5 +1680*x^4 -248*x^3 -144*x^2 +24*x +1. - R. J. Mathar, Jun 03 2026

Example

0.99756405025982424761316268064425502636937766038422...

Maple

Digits:=100: evalf(cos(Pi/45)); # Wesley Ivan Hurt, Aug 31 2014

Mathematica

RealDigits[Cos[Pi/45], 10, 100, -1][[1]] (* Wesley Ivan Hurt, Aug 31 2014 *)

Prog

(PARI) cos(Pi/45) \\ Stefano Spezia, Feb 09 2025

Crossrefs

Cf. A019852, A019856.

Sequence in context: A277587 A372828 A201570 * A196399 A388362 A239528

Adjacent sequences: A019892 A019893 A019894 * A019896 A019897 A019898

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved