Introduction to the trigonometric angle addition identities

# Using the trig angle addition identities

Find the trig values of sums of angles whose individual trig values are known.

Introduction to the trigonometric angle addition identities

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