Radians, the unit circle and exact values

What this note covers

1. Radians measure angle through arc length
2. The unit circle defines sine and cosine
3. Deriving the standard exact values
4. Reference angles and coterminal rotations
5. Using the Pythagorean identity with quadrant data
6. Exact evaluation, notation and meaningful checks

6 sections · 10 key terms & formulas · 6 common mistakes