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tanh(sec(x)*arctanh(x))=x+3/3!*x^3-15/5!*x^5-1869/7!*x^7-88959/9!*x^9...
0

%I #4 Feb 24 2012 12:51:10

%S 1,3,-15,-1869,-88959,202499,974640433,190241481587,15481756625281,

%T -5564353308576125,-3510791865515349775,-961065703006847944525,

%U 92025876595389114977025,299254465799630697304777347

%N tanh(sec(x)*arctanh(x))=x+3/3!*x^3-15/5!*x^5-1869/7!*x^7-88959/9!*x^9...

%K sign

%O 0,2

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