This app allows you to have the fundamental formulas you will need for your Calculus class on your phone. You will not have to look them up online or in your book every time you are doing your homework or problem sets. It contains all the trigonometry, exponential and regular derivative and integral formulas. Even if you do not have an internet connection or you simply do not want to spend data on looking at formulas, you can look them up on this app. They will always be in your phone and never leave your side.