Unit Circle: Sine and Cosine Functions

What you'll learn

1. Define sine and cosine in terms of coordinates on the unit circle
2. Find exact values of sine and cosine for special angles (30°, 45°, 60° and their radian equivalents)
3. Identify the domain and range of sine and cosine functions
4. Use reference angles to evaluate trigonometric functions in any quadrant
5. Determine the signs of sine and cosine in each quadrant

Prerequisites

• Angles