Trigonometric Identities

At the start of class Mr. Maksymchuk let us explore the internet to find out what trigonemtric identities are. He gave us a list of trigonometric identities and gave us an example using them. The way I understood it was that trigonemetric identities are the different patterns showing the similarities between the different trig functions. The Mickleson book has some good examples that helped me to understand it.