Periodic Functions in CT - The Tangent Function
A periodic function is a function that repeats itself after a certain time, called the period.
An example of this function is shown below, the tangent function. The tangent function has a period of $ pi $.
$ \tan\theta = \frac{\sin\theta}{\cos\theta}\, $
Non-periodic Functions in CT - The Natural Logarithm
A non-periodic function is a function that does not repeat itself after the same amount of time.
An example of this function is the natural logarithm function, shown below. This function is defined for x > 0, and after x = 0, the function increases.
y = ln(x)
