Up until last night, I was not sure why I had purchased the textbook that supposedly goes along with this pre-calc class. My teacher had not taught out of the book at all. He had in fact told me that if he had his way he would not have us buy the book at all as he did not use it.
Based on this, I had not opened the book since about the third class.
For some reason, last night he apparently reverted his lessons back to the book.
Now, I don't know this for sure as I haven't even glanced over the supposed chapter last night was supposed to cover. Throughout class last night, he referred over and over to the chapter we were supposed to be covering. I guess I'll break open the book today to see if the chapter correlates to the material he presented us.
Why he would decide to suddenly use the book when we only had two classes left, I cannot tell you. It will be nice to have some other material to refer to in studying for the final though!