Intro Tangent & Cotangent Graphs

Using the unit circle I explain why Tangent and Cotangent have a period of Pi instead of 2Pi like the other trig functions. I then graph the two parent functions discussing domain and range as well. Check out http://www.ProfRobBob.com/, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage    / profrobbob