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cos(arctan(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-544/6!*x^6+25344/8!*x^8...
0

%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)