Trigonometric Identities

百科全书的三角恒等式，包括教育测验。

This is an app created by students for students. Studying within mathematics may cause you to need to know trigonometric identities in order to solve problems. Our app gives you the possibility to look up any trigonometric identity at your command, free of charge. The app is designed to be user friendly in your search for trigonometric identities.

If you, like us, would like to learn the most basic and useful trig identities, we have designed an educational quiz, giving you the opportunity to memorize the identities in a quick and effective way, leaving you free to simplify most expressions by your own. With the app in backup if you are in doubt.

We sincerely hope you will find this app useful in your further studies.

We appreciate all feedback, both positive and negative. Nevertheless, we do hope you might give us the opportunity to fix any problems you might be experiencing with the app, before giving us negative feedback in the store.