Familiar functions like polynomials and exponential functions don’t exhibit periodic behavior, so we turn to the trigonometric functions. Before we can define these functions, however, we need a way t...Familiar functions like polynomials and exponential functions don’t exhibit periodic behavior, so we turn to the trigonometric functions. Before we can define these functions, however, we need a way to introduce periodicity. We do so in a manner similar to the thought experiment, but we also use mathematical objects and equations. The primary tool is something called the wrapping function. Instead of using any circle, we will use the so-called unit circle.
