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0,2
Also the imaginary part of i^(1/10). [Stanislav Sykora, Apr 25 2012]
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Exact trigonometric constants, Wikipedia
0.1564344650402308690101053194671668923138...
sqrt(8-2*sqrt(10+2*sqrt(5)))/4 = sqrt((1/2)*(1 - sqrt((1/8)*(5 + sqrt(5))))). - Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 13 2006
RealDigits[Sin[9 Degree], 10, 120][[1]] (* Harvey P. Dale, Sep 15 2014 *)
Sequence in context: A087197 A221216 A229073 * A187146 A128632 A197490
Adjacent sequences: A019815 A019816 A019817 * A019819 A019820 A019821
nonn,cons
N. J. A. Sloane.
approved