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%I #4 Feb 24 2012 12:51:29
%S 1,0,0,-10,-840,-87750,-12248500,-2253971850,-533589966000,
%T -158691603820750,-58067784952807500,-25679245305449531250,
%U -13515821293834796365000,-8355912675896675805093750
%N sech(arcsin(x)-arctanh(x))=1-10/6!*x^6-840/8!*x^8-87750/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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