Following an example attributed to Hardy, we will use the residue theorem to sum the series (k^2-1) for positive integers k, by convergent the tangent to two cotangents via the identity tan A = cot A - 2 cot 2 A
Following an example attributed to Hardy, we will use the residue theorem to sum the series (k^2-1) for positive integers k,by convergent the tangent to two cotangents via the identity tan A = cot A - 2 cot 2 A