The General Cosine Function

The cosine function is one of the more common circular functions. The domain of the cosine is (-inf, inf). The base range is (-1, 1).
The red dashed line is the base cosine function. One period is always highlighted. The blue line is the cosine in general form. This applet can be used by teachers in a demonstration mode in the classroom or teachers can have students load it on their own computers with a worksheet to be complete for a grade.