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%I #6 Aug 21 2020 15:14:13
%S 1,-1,-7,-169,-8751,-789681,-110381943,-22142611737,-6041067843807,
%T -2153812782224097,-972958293249140583,-543350342541113761545,
%U -367659108914973687690255,-296447255926407313341954705
%N cos(arcsin(arcsin(x)))=1-1/2!*x^2-7/4!*x^4-169/6!*x^6-8751/8!*x^8...
%t With[{nn=30},Take[CoefficientList[Series[Cos[ArcSin[ArcSin[x]]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Aug 21 2020 *)
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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