A201505 Decimal expansion of cos(1/2).

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, 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, 0, 7, 6, 3, 2, 7, 4, 2, 1, 3, 9, 4, 7, 4, 0, 5

Offset: 0

Author

R. J. Mathar, Dec 02 2011

Keywords

• cons
• nonn
• easy

Comments

By the Lindemann-Weierstrass theorem, this constant is transcendental. - Charles R Greathouse IV, May 13 2019

Examples

			0.877582561890372716... = sqrt((1+A049470)/2) = sqrt(1-A201504^2).
		

Links

• Index entries for transcendental numbers

Crossrefs

Cf. A053988.

Programs

Maple

evalf(cos(1/2)) ;

Mathematica

RealDigits[Cos[1/2],10,120][[1]] (* Harvey P. Dale, Sep 22 2016 *)

PARI

cos(1/2) \\ Charles R Greathouse IV, May 13 2019

Formula

Taylor series representation: 1 -1/(2^2*2!) +1/(2^4*4!) -1/(2^6*6!) -...