# Periodic function

### Periodic function

Hi
I need help with finding an example of a periodic function that does not have a primitive period. How would I get such function?
Guest

### Re: Periodic function

The period of the function y = 5 cos 4x
is $$\frac{\pi}{2}$$

The period of the function $$y = 6 \sin\frac{2x}{3}$$ is $$3\pi$$
Guest