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%I #6 Oct 14 2019 13:42:28
%S 1,0,-12,120,-7728,358080,-54956352,5983845504,-1674895273728,
%T 331567748941824,-147083657045302272,46138766175213803520,
%U -29742693904194176593920,13565163573403491059712000
%N cos(arctan(x)*arcsin(x))=1-12/4!*x^4+120/6!*x^6-7728/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cos[ArcTan[x]ArcSin[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Oct 14 2019 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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