Learn how to use double-angle trig identities for sine and cosine in writing algebraic proofs for given trig identities.
See the rest of my videos covering other Trigonometric Identities concepts:    • ★ Trig Identities [Chapter 6] Pre-Cal...  

Corresponds to chapter 6, sections 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...

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