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The unit circle helps to illustrate angular functions such as sine and cosine. Mai explains how to do this in this video. Need to know more? Then feel free to subscribe: http://bit.ly/Mathe_Abo Any questions? Then ask them in the comments! Check out the other must-know channels: Chemistry: http://bit.ly/Chemie_Abo History: http://bit.ly/Geschichte_Abo German: http://bit.ly/Deutsch_Abo We are also part of #funk. Be sure to check it out: YouTube: / funkofficial Funk Web-App: https://go.funk.net Facebook: / funk https://go.funk.net/impressum