Decomposition of composite function... | Filo

Khan Academy

Functional Decomposition: Solving Complex Problems Without Complexity

Fourier series provide a powerful way to represent complicated periodic functions as infinite sums of simple sine and cosine waves. The central idea is that any reasonably well-behaved periodic function can be decomposed into a weighted combination of oscillations with different frequencies, amplitudes, and phases. These basic waves act like building blocks: low-frequency terms capture the overall shape of the function, while higher-frequency terms refine its details. Mathematically, the coeffic