%I #4 Feb 24 2012 12:51:15
%S 1,-4,16,-544,25344,-1920384,246359040,-39508168704,9120978370560,
%T -2587275558617088,939278027083448320,-411971792033339539456,
%U 217927272725489369743360,-135949730585003375068184576
%N cos(arctan(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-544/6!*x^6+25344/8!*x^8...
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)