I found a really neat site that illustrates the geometric interpretation of sine, cosine, tangent and cotangent that we we're talking about in class last Friday. Check it out! You can change the lengths of the lines in the figure by clicking on the point on the circle where the "sin x" and "cos x" lengths intersect.
Tomorrow we're going to talk about how to graph the sine, cosine and tangent functions. You can do a little preview here.
If you missed class today; you should know there was a quiz and there will be a unit test as early as Thursday.