Plane and spherical trigonometry text / workbook - Baltazar, Ethel Cecille M.; Dy, Ana Liza M.; Vidar, Melvin A. (Quezon City C & E Publishing, Inc., 2014)
Keywords: Plane trigonometry -- Problems, exercises, etc; Spherical trigonometry -- Problems, exercises, etc; Trigonometry -- Textbooks; Trigonometry -- Problems, exercises, etc