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 A019851 Decimal expansion of sine of 42 degrees. 5
 6, 6, 9, 1, 3, 0, 6, 0, 6, 3, 5, 8, 8, 5, 8, 2, 1, 3, 8, 2, 6, 2, 7, 3, 3, 3, 0, 6, 8, 6, 7, 8, 0, 4, 7, 3, 5, 9, 9, 5, 8, 3, 2, 1, 8, 9, 5, 9, 7, 9, 5, 6, 7, 6, 8, 1, 7, 4, 5, 3, 3, 5, 2, 2, 8, 7, 9, 6, 6, 6, 0, 1, 7, 1, 0, 6, 4, 3, 8, 9, 7, 1, 4, 6, 1, 5, 4, 9, 2, 3, 3, 6, 0, 0, 9, 0, 0, 6, 7 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This sequence is also decimal expansion of cosine of 48 degrees. - Mohammad K. Azarian, Jun 29 2013 A quartic number with denominator 2. - Charles R Greathouse IV, Nov 05 2017 LINKS Ivan Panchenko, Table of n, a(n) for n = 0..1000 Wikipedia, Exact trigonometric constants FORMULA Equals cos (4*Pi/15) = [sqrt(5)-1]*[sqrt(3)*sqrt{5+2*sqrt(5)}-1]/8 = 8*A019887^4 -8*A019887^2+1 = sqrt(1-A019857^2) - R. J. Mathar, Jun 18 2006 PROG (PARI) sin(7/30*Pi) \\ Charles R Greathouse IV, Nov 05 2017 CROSSREFS Sequence in context: A083507 A157320 A200616 * A155880 A217852 A021603 Adjacent sequences:  A019848 A019849 A019850 * A019852 A019853 A019854 KEYWORD nonn,cons AUTHOR STATUS approved

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Last modified May 26 15:17 EDT 2019. Contains 323596 sequences. (Running on oeis4.)