cp's OEIS Frontend

A201505 Decimal expansion of cos(1/2).

%I A201505 #15 May 14 2020 03:34:06
%S A201505 8,7,7,5,8,2,5,6,1,8,9,0,3,7,2,7,1,6,1,1,6,2,8,1,5,8,2,6,0,3,8,2,9,6,
%T A201505 5,1,9,9,1,6,4,5,1,9,7,1,0,9,7,4,4,0,5,2,9,9,7,6,1,0,8,6,8,3,1,5,9,5,
%U A201505 0,7,6,3,2,7,4,2,1,3,9,4,7,4,0,5
%N A201505 Decimal expansion of cos(1/2).
%C A201505 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019
%H A201505 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A201505 Taylor series representation: 1 -1/(2^2*2!) +1/(2^4*4!) -1/(2^6*6!) -...
%e A201505 0.877582561890372716... = sqrt((1+A049470)/2) = sqrt(1-A201504^2).
%p A201505 evalf(cos(1/2)) ;
%t A201505 RealDigits[Cos[1/2],10,120][[1]] (* _Harvey P. Dale_, Sep 22 2016 *)
%o A201505 (PARI) cos(1/2) \\ _Charles R Greathouse IV_, May 13 2019
%Y A201505 Cf. A053988.
%K A201505 cons,nonn,easy
%O A201505 0,1
%A A201505 _R. J. Mathar_, Dec 02 2011