cos(tan(x)-tanh(x))=1-160/6!*x^6-261120/10!*x^10+3942400/12!*x^12...

A013454

cos(tan(x)-tanh(x))=1-160/6!*x^6-261120/10!*x^10+3942400/12!*x^12...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =-160a(4) =0a(5) =-261120a(6) =3942400a(7) =-1538068480a(8) =111522611200

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