Verifying Trigonometric Identities Intro (4 Examples)

Four Trig proofs start at 0:50 , 9:18 , 16:19 , 25:03
Check out http://www.ProfRobBob.com, there you will find my lessons organized by chapters within each subject.
If you’d like to make a donation to support my efforts look for the “Tip the Teacher” button on my channel’s homepage www.YouTube.com/Profrobbob