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