I was hoping I would get to use this interactive notebook page idea next year.  I'm a little sad that I won't!  I was secretly hoping to teach pre-cal next year...not sure why...
I found 
this small unit circle from Jean Adams on TpT.  It's a free download.  I like that it's small enough to fit in the notebook and still has room to label all of the important information. 
I also drew a little coordinate grid to help students remember where the x and y values are positive and negative.  Sometimes it's nice to have a quick reference.