You should KNOW 

1. The definition of the sine and cosine of ANY angle, not just those in a right triangle. (FP p.192)

2. The fundamental identity: sin^2(x) + cos^2(x) =1
and how it arises from the Pythagorean Theorem.

3. The exact values (in terms of radicals) of the sine and cosine of 0, 30, 45, 60, and 90 degrees and the corresponding radian measure of these angles.

4. How the determine the sine and cosine of an angle by relating it to an angle in the first quadrant.
  

You should be ABLE TO

1. Find the sines and cosines of multiples of the common angles of 30, 45, and 60 degrees, without use of a calculator, and also if these angles are measured in radians.

2. Determine the cosine of an angle from its sine and the quadrant in which it lies, and vice versa.

3. How to use your calculator to look up sines and cosines of angles given in degrees or in radians.