A013089 - OEIS

A013089

cos(arcsinh(x)+arcsin(x))=1-4/2!*x^2+16/4!*x^4-280/6!*x^6+8320/8!*x^8...

%I #4 Feb 24 2012 12:51:18

%S 1,-4,16,-280,8320,-628000,51414400,-8930646400,1426497280000,

%T -444950339392000,117131784689920000,-57406016313168640000,

%U 22526613550121973760000,-15953943354322290304000000

%N cos(arcsinh(x)+arcsin(x))=1-4/2!*x^2+16/4!*x^4-280/6!*x^6+8320/8!*x^8...

%K sign

%O 0,2

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