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%I #25 Aug 21 2023 11:28:17
%S 9,8,4,8,0,7,7,5,3,0,1,2,2,0,8,0,5,9,3,6,6,7,4,3,0,2,4,5,8,9,5,2,3,0,
%T 1,3,6,7,0,6,4,3,2,5,1,7,1,9,8,4,2,4,1,8,7,9,0,0,2,5,7,5,2,3,5,5,8,2,
%U 7,5,9,9,9,4,3,0,3,6,2,3,9,2,7,4,6,7,8,4,1,0,0,5,6,1,1,9,8,9,9
%N Decimal expansion of sine of 80 degrees.
%C Also the real part of I^(1/9). - _Stanislav Sykora_, Nov 29 2013
%C Equals sin(4*Pi/9). - _Wesley Ivan Hurt_, Sep 01 2014
%H Ivan Panchenko, <a href="/A019889/b019889.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Al#algebraic_06">Index entries for algebraic numbers, degree 6</a>
%F Equals 2F1(7/12,5/12;1/2;3/4) / 2. - _R. J. Mathar_, Oct 27 2008
%F Equals 2*A019849*A019859. - _R. J. Mathar_, Jan 17 2021
%e 0.9848077530122080593667430245895230136706432517198424187900...
%p Digits:=100: evalf(sin(4*Pi/9)); # _Wesley Ivan Hurt_, Sep 01 2014
%t RealDigits[ Cos[Pi/18], 10, 111] (* _Robert G. Wilson v_ *)
%t RealDigits[Sin[80 Degree],10,120][[1]] (* _Harvey P. Dale_, Apr 16 2022 *)
%o (PARI) real(I^(1/9)) \\ _Michel Marcus_, Nov 29 2013
%K nonn,cons
%O 0,1
%A _N. J. A. Sloane_.
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