Animation of the the graphs of sine and cosine:
http://www.intmath.com/trigonometric-graphs/1-graphs-sine-cosine-amplitude.php
https://www.youtube.com/watch?v=CWjVy4iTVAI
HW: Complete the 6 graphs (4 should already be done) on today's worksheet. Quiz 13.3 is tomorrow, May 12th. Test will be in 1 week!