1.2 Unit Circle

OpenStax Precalculus 2e — Chapter 5, Section 5.2

Learning Objectives

  • Define sine and cosine as coordinates on the unit circle

  • Identify \((\cos\theta, \sin\theta)\) for all 16 standard angles

  • Determine the sign of trig functions by quadrant

  • Use symmetry to derive values in all four quadrants from Q I values

Key Concepts

To be filled during study.

Practice Problems

To be completed with textbook exercises.

Section Summary

To be written after completing the section.

Study Notes

Personal observations and connections to engineering work.