In this lesson, Julie Harland, aka Your Math Gal, walks us through two trig proofs using all of the basic identities up through half-angle identities. By verifying the given identities, she shows how to use formulas like double-angle identities, and how to recognize patterns to simplify expressions. By the end of the lesson, you'll have gained a solid understanding of the trig identities and their uses.
Two more trig proofs shown and explained.
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com