Wanted to make flash cards for the exact values of the trig functions and the needed formulas, but once I sat down to get started... it seemed a bit overwhelming. So many different formulas, so many different directions to know the information in. I came up with a very basic design first and over the years it's turned into quite the information toting little resource. Several of my former students have said how helpful it was in college, students who didn't have me for class wanted one, and a couple of teachers in an adjacent district use it every year in their classes. They say its very helpful and such a time saver.