#
Unit Circle Definition of Trig Functions

Using the unit circle to define the sine, cosine, and tangent functions

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content
#
Unit Circle Definition of Trig Functions

Using the unit circle to define the sine, cosine, and tangent functions