Learn how to use special triangles, reference angles, and the unit circle to calculate the exact value of trig ratios that involve angles of 30, 45, and 60 degrees. Go to jensenmath.ca for the FREE accompanying resources.
0:00 - initial arm vs. terminal arm
0:54 - principal angle vs reference angle
1:45 - example 1 (calculating reference angles)
4:15 - trig ratios using x, y, and r
5:52 - CAST rule
8:10 - Example 2 (finding exact value of ratios)
13:50 - example 3 (trig ratios given point on terminal arm)
17:47 - the Unit Circle
19:18 - example 4 (trig ratios using unit circle)
20:50 - Negative and Co-terminal angles
22:15 - Example 5 (find co-terminal angles)
23:12 - Example 6 (trig ratios of negative angles)