login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A019815 Decimal expansion of sine of 6 degrees. 4

%I

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

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

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

%N Decimal expansion of sine of 6 degrees.

%C Decimal expansion of 1/8 (-1 - Sqrt[5] + Sqrt[6 (5 - Sqrt[5])]) - _Artur Jasinski_, Oct 28 2008

%H Ivan Panchenko, <a href="/A019815/b019815.txt">Table of n, a(n) for n = 0..1000</a>

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a>

%F Equals cos(7*Pi/15) = -cos(8*Pi/15) = 2F1(6/5,-1/5;1/2;3/4) / 2 = - 2F1(13/10,-3/10;1/2;3/4) / 2 . - _R. J. Mathar_, Oct 27 2008

%t First[RealDigits[1/8 (-1 - Sqrt[5] + Sqrt[6 (5 - Sqrt[5])]), 10, 100]] - _Artur Jasinski_, Oct 28 2008

%t RealDigits[Sin[6 Degree],10,120][[1]] (* _Harvey P. Dale_, Apr 27 2012 *)

%o (PARI) sin(Pi/30) \\ _Charles R Greathouse IV_, Jan 30 2016

%K nonn,cons

%O 0,3

%A _N. J. A. Sloane_.

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 27 07:07 EST 2020. Contains 332300 sequences. (Running on oeis4.)