References for Trigonometry and Analytic Geometry

Trigonometry | 2nd Edition: James Stewart, Lothar Redlin, Saleem Watson; Copyright 2013 CENGAGE; cengage.com/c/trigonometry-2e-stewart/9781111574482/
Trigonometry: A Unit Circle Approach | Eleventh Edition: Michael Sullivan; Copyright 2020 Pearson; pearson.com
Trigonometry: I. M. Gelfand, Mark Saul; Copyright 2001 I. M. Gelfand; DOI: 10.1007/978-1-4612-0149-6
Trigonometric Delights: Eli Maor; Copyright 1998 Princeton University Press; ISBN: 0-691-05754-0
103 Trigonometry Problems From the Training of the USA IMO Team: Titu Andreescu , Zuming Feng; Copyright 2005 Birkhäuser Boston; DOI: doi.org/10.1007/b139082; eBook ISBN: 978-0-8176-4432-1
Spherical Trigonometry with Naval and Military Applications: Lyman M. Kells, Willis F. Kern, James R. Bland; Copyright 1942 McGraw-Hill Book Company Inc.