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arcsinh(arcsinh(x)*cos(x))=x-5/3!*x^3+73/5!*x^5-3565/7!*x^7...
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%I #7 Nov 21 2013 12:46:01

%S 1,-5,73,-3565,337873,-53181845,12563583641,-4158179320061,

%T 1836546568939681,-1043609929405146661,741652625178569817577,

%U -644417189348695489885965,672084091294680203529876081

%N arcsinh(arcsinh(x)*cos(x))=x-5/3!*x^3+73/5!*x^5-3565/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[ArcSinh[ArcSinh[x]Cos[x]],{x,0,nn}], x]Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Sep 16 2011 *)

%K sign

%O 0,2

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