## What Is Fourier Series?

What is fourior Series

## IS Fourier Series Used In Real Life?

Some real world application of fourier series:-

## Is Complex Fourier Is Same With Real Fourier?

Complex form of fourier series

## Do You Know About History Of Matrix?

What is Matrices:-

## Is If x Belong To The Domain Than f(x) belong To The Range ?

Let $$F : x \Rightarrow y$$
Let $$f : X \rightarrow Y$$ be a function. If B is subset of y then its inverse image $$f^-B$$ is the subset of x define by