Open Educational Resources
Document Type
Textbook
Publication Date
Fall 8-27-2025
Abstract
These five units are specifically tailored to foster the mastery of a few selected trigonometry topics that comprise the one credit MA-121 Elementary Trigonometry course. Each unit introduces the topic, provides space for practice, but more importantly, provides opportunities for students to reflect on the work in order to deepen their conceptual understanding.
These units have also been assigned to students of other courses such as pre-calculus and calculus as a review of trigonometric basics essential to those courses. This is the third edition of the materials. Based on suggestions from instructors Units 2 and 3 have been edited to align with new questions on the final assessment for this course. More specifically, Section 2.3 Inverse Trigonometric Functions was added, but limited to right triangles. Section 3.5 The Unit Circle was added but limited to finding the coordinates of a point on the unit circle. Additional practice problems and solutions have also been added for Units 2 and 3.
We are grateful for the support we received from the Open Educational Research (OER) initiative of the City University of New York (CUNY). This 2025 edition is the third edition and was part of the OER Workshop-Cohort VIII.
We thank ALL of the MA-121 instructors for their invaluable input.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.
CUNY OER Funding
CUNY OER Initiative
