cos(arctan(x)*tan(x))=1-12/4!*x^4-7280/8!*x^8+241920/10!*x^10...

A012448

cos(arctan(x)*tan(x))=1-12/4!*x^4-7280/8!*x^8+241920/10!*x^10...

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =0a(4) =-7280a(5) =241920a(6) =-39796416a(7) =5601756160

External references