1. Objective: use the Unit Circle instead of a calculator to evaluating trig functions How is the Unit Circle used in place of a calculator?

2. x y 1 Ѳ

3.  cos(45°)  sin(120°) 

4.  Divide the coordinates (y on top)  Dividing fractions: “Keep, Change, Flip”

5. a. b.c.

6.  tan(45°)  tan(120°) 

7. cscθ = cotθ = Reciprocal of “cosine” Reciprocal of “sine” Reciprocal of “tangent”

8.  sec(45 °)  csc(120°) 

9.  What happens when you try to evaluate these functions? a. tan(90 °)b. tan(270°)

15. How many radians is 90 degrees?

18. How many radians is 360 degrees?

22. How many radians is 180 °?

33. How many radians is 270 °?