1. Trigonometric Function: The Unit circle

2. Some common radian measurements
These are the Degree expressed in Radians

3. The Unit Circle: Radian Measures and Coordinates

4. The Six Trig functions

5. Lets find the Trig functions if
Think where this angle is on the unit circle.

6. Find the Trig functions of
Think where this angle is on the unit circle.

7. How about

8. There are times when Tan or Cot does not exist.

9. If think of the domain of the trig functions, there are some limits.
Look at the unit circle. If x goes with Cos, then what are the possible of Cos?
It is the same with
Sin?