Have you ever wondered why sines and cosines have the values they do? Not familiar with what the sines and cosines of certain angles are? This app is indispensable for the beginning physicist or mathematician, as well as teachers and seasoned veterans. This app tells the story of how and why sine and cosine values are what they are as well as providing a detailed tap and flash card style review. If you can count to 4 you can do sines and cosines. Good luck!