Decimal expansion of sine of 80 degrees = cos(Pi/18).

Terms

a(0) =9a(1) =8a(2) =4a(3) =8a(4) =0a(5) =7a(6) =7a(7) =5a(8) =3a(9) =0a(10) =1a(11) =2a(12) =2a(13) =0a(14) =8a(15) =0a(16) =5a(17) =9a(18) =3a(19) =6a(20) =6a(21) =7a(22) =4a(23) =3a(24) =0a(25) =2a(26) =4a(27) =5a(28) =8a(29) =9