An introduction to sum and difference trig identities (aka ‘addition identities’) for sine and cosine, and how they can be used to simplify trig expressions, complete proofs, and solve problems involving sums and differences of angles.
See the rest of my videos covering other Trigonometric Identities concepts:    • ★ Trig Identities [Chapter 6] Pre-Cal...  

Corresponds to chapter 6, sections 6.2 and 6.3 in McGraw-Hill's Pre-Calculus 12, but also fits with the trigonometry unit from almost any other Pre-Calculus course or textbook.

My instructional approach emphasizes conceptual understanding of and connections between concepts and ideas, rather than just pure memorization.

A PDF copy of the 'Video Guide' document used in these videos as well as lots of other resources are available at https://drive.google.com/drive/folder...

#PreCalc12bytheAAMG