# Representing Periodic Functions by Fourier

Functions by **Fourier Series** 23.2 **Introduction** In this Section we show how a periodic function can be expressed as a **series** of sines and cosines. We begin by obtaining some standard integrals involving sinusoids. We then assume that if f(t) is a periodic function, of period 2π, then the **Fourier series** expansion takes the form: f(t) = a 0 2 + X ...

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