cos(arctan(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-544/6!*x^6+25344/8!*x^8...

A013001

cos(arctan(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-544/6!*x^6+25344/8!*x^8...

Terms

    a(0) =1a(1) =-4a(2) =16a(3) =-544a(4) =25344a(5) =-1920384a(6) =246359040a(7) =-39508168704

External references