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%I #30 Aug 21 2023 11:41:57
%S 2,0,7,9,1,1,6,9,0,8,1,7,7,5,9,3,3,7,1,0,1,7,4,2,2,8,4,4,0,5,1,2,5,1,
%T 6,6,2,1,6,5,8,4,7,6,0,6,2,7,7,2,3,8,3,6,4,0,7,1,8,1,9,7,3,8,8,2,3,8,
%U 2,8,2,5,6,6,4,0,7,4,3,7,6,3,0,4,6,2,8,7,5,6,7,2,2,7,2,7,5,7,3
%N Decimal expansion of sine of 12 degrees.
%C An algebraic number of degree 8 and denominator 2. - _Charles R Greathouse IV_, Aug 27 2017
%H Ivan Panchenko, <a href="/A019821/b019821.txt">Table of n, a(n) for n = 0..1000</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a>
%H <a href="/index/Al#algebraic_08">Index entries for algebraic numbers, degree 8</a>
%F Equals sin(Pi/15) = sqrt(1-A019887^2) = (sqrt(5)-1)*(sqrt(5+2*sqrt(5)) - sqrt(3))/8. - _R. J. Mathar_, Jun 18 2006
%F Equals 2*A019815*A019893. - _R. J. Mathar_, Jan 17 2021
%e 0.20791169...
%t RealDigits[N[Sin[Pi/15], 110]][[1]] (* _Wesley Ivan Hurt_, Dec 27 2021 *)
%o (PARI) sin(Pi/15) \\ _Charles R Greathouse IV_, Aug 27 2017
%Y Cf. A019815, A019887, A019893.
%K nonn,cons
%O 0,1
%A _N. J. A. Sloane_
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