The Fundamental Trigonometric Identities
Channel: Andrew Misseldine
Date: 2021-05-20

In this video, we review the fundamental trigonometric identities, that is, the reciprocal, the ratio, the Pythagorean, the complementary, and the symmetric identities for the six trigonometric functions. We demonstrate how to use these to simplify basic trigonometric expressions and how to express any trigonometric expression using just sine or cosine.

This is lecture 15 (part 1/6) of the lecture series offered by Dr. Andrew Misseldine for the course Math 1060 - Trigonometry at Southern Utah University. A transcript of this lecture can be found at Dr. Misseldine's website or through his Google Drive at: https://drive.google.com/file/d/12DJl9_ES6J4nqME9yMFOvqbzS1ZZ4dGA/view

This lecture is based upon general college trigonometry curriculum and not based upon an individual textbook. With that said, this lecture series is influenced by many great trigonometry textbooks on the market, namely Sullivan's, Stewart's, OpenStax's, McKeague's, Stitz-Zeager's, and many others. Please post any questions you might have below in the comment field and Dr. Misseldine (or other commenters) can answer them for you. Please also subscribe for further updates.