cos(arctan(x)-arctanh(x))=1-160/6!*x^6-691200/10!*x^10+3942400/12!*x^12...

A013465

cos(arctan(x)-arctanh(x))=1-160/6!*x^6-691200/10!*x^10+3942400/12!*x^12...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =-160a(4) =0a(5) =-691200a(6) =3942400a(7) =-14125363200a(8) =295206912000

External references