LE COINTE, Leçons sur la théorie des fonctions circulaires, 1858

First edition.
This work is a didactic manual on trigonometry and the theory of circular functions. It is intended for students preparing for the entrance exams of the Écoles du Gouvernement, and particularly the École Polytechnique. The author, Father Louis-Léonard-Auguste Le Cointe, was a French mathematician and Jesuit priest. The book was designed for teaching and contains numerous exercises.