Chapter 03 · Trigonometry
03.06
The Unit Circle
Define sine and cosine for every angle as coordinates on a circle of radius 1.
About 18 minutes
You'll learn to
- →Find sine and cosine from points on the unit circle
- →Use reference angles and quadrant signs
- →Evaluate trig functions at key angles, including periodic ones
- →Read amplitude, period and shifts from y = A sin(Bx − C) + D