Day 9

I went through a box full of random stuff today.  One of the things I found was my old graphing calculator from high school.  I opened it up and found a surprise - four formulas were written inside the cover, either from Trig or Calculus.  But the funny thing to me is that I have absolutely no clue what these mean.  They are like a foreign language, they mean nothing to me.  But one day not so long ago, I knew exactly what they were & how to use them.  Back in the day, I loved me some Calculus!  Just a reminder of how much I have changed.