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tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7...
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%I #4 Feb 24 2012 12:50:44

%S 1,-5,129,-7741,830529,-139115349,33466193409,-10924199283981,

%T 4643317555286145,-2490727724722757925,1645111995753399461505,

%U -1311624218654589461390685,1241813393715548870981284545

%N tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7...

%K sign

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)