The answer is (E).
You may also see a question on one or more of the following topics.
A periodic function is one that cycles over and over again, like the sine function.
The fundamental period of a function is the length of a smallest complete cycle. For the sine
function, the period is 2π. For large values, you can evaluate a function just by calculating the
function at the remainder after dividing by the fundamental period.
For example, sin 9 π = sin π = 0.
A piecewise function is a function that is defined in intervals; that is, for different values, you
perform different calculations.
When evaluating piecewise functions, just be sure to make sure that you're calculating in the correct
interval.
A recursive function is one that is defined by how the terms in the sequence are related to the
preceding terms. For example, the function known as the factorial is a recursive function: