Deriving Trigonometric Identies from Known Identities

Thanks to all of you who support me on Patreon. You da real mvps! $1 per month helps!! :)   / patrickjmt   !! Deriving Trigonometric Identies from Known Identities - In this video I show that if you know about 2 or 3 identities and a few definitions, you can actually derive lots of other trigonometric identities easily! For more free math videos, visit http://JustMathTutoring.com