Using complete sentences, explain the key features of the graph of the cosine function.

The trigonometric functions have features that are worthy of note. Among these features are the period and the amplitude. The graph of f (x) = cos x repeats itself along the x-axis by a certain distance. This distance is called the period. For the cosine function, the period is 2pi radians. It can also be observed that the graph goes up and down by a certain distance. This distance is called the amplitude. For the curve of f (x) = cos x, the amplitude is 1. The main difference between a cosine function and a sine function is that the former is symmetric with respect to the y-axis while the latter is symmetric with respect to the origin.