📐 2. Fourier Series General Concepts Tags Fourier series basics periodic functions fundamental period trigonometric series orthogonality of sine and cosine Fourier series theory sine cosine integrals Fourier analysis tutorial periodic signals mathematics. Before building a Fourier series, we need to understand periodic functions and a few key properties of sine and cosine integrals. These concepts explain why complicated periodic signals can be decomposed into simple waves.
