We generalize Rademacher's reciprocity formula for the Dedekind sum to a family of cotangent sums. One of the sums in this family is strictly related to the Vasyunin sum, a function defined on the rationals that is relevant to the Nyman-Beurling-Báez-Duarte approach to the Riemann hypothesis.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa159-4-5, author = {Sandro Bettin}, title = {A generalization of Rademacher's reciprocity law}, journal = {Acta Arithmetica}, volume = {161}, year = {2013}, pages = {363-374}, zbl = {1288.11042}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa159-4-5} }
Sandro Bettin. A generalization of Rademacher's reciprocity law. Acta Arithmetica, Tome 161 (2013) pp. 363-374. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa159-4-5/