Video about finding the equation of a trigonometric function from its graph. Two examples are sine functions and one example is a cosine function [9:52]

Video showing how to derive the graph of the sine function from the unit circle. Includes link to additional practice problems. [7:44]

Video showing how to graph the sine and cosine functions from their equations with modifications to the amplitude and period. Also gives an example of determining the trigonometric function using the features of the graph. Includes link...

This site provides a video tutorial on the topic of trigonometric limits. The video considers limits at infinity for sine, cosine and tangent functions.