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arcsin(arctan(x)+tan(x))=2*x+8/3!*x^3+328/5!*x^5+31712/7!*x^7...
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%I #6 Jan 03 2022 15:00:46

%S 2,8,328,31712,6354304,2085514752,1027652193280,707087567055872,

%T 648127370395910144,763186372089893650432,1122739235799995992047616,

%U 2017897729638659884887834624,4350781970507936954099174998016

%N arcsin(arctan(x)+tan(x))=2*x+8/3!*x^3+328/5!*x^5+31712/7!*x^7...

%t With[{nn=30},Take[CoefficientList[Series[ArcSin[ArcTan[x]+Tan[x]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Jan 03 2022 *)

%K nonn

%O 0,1

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