We feel like we've gotten to know angles really well lately. We've been working with trig functions a lot, using them to find all kind of errant angles. We might be the world's premier angle experts at this point.
We've been so focused on angles, though, that we might have lost the trig values themselves. Uh, oops. Don't worry, we can fix this, and we'll use the inverse trig functions to do it.