Changes

'''Fourier series''' express a piecewise, continuous, periodic function as a linear combination of [[orthogonal]] [[sine]] and [[cosine]] functions.

'''Fourier series''' express a piecewise continuous, bounded, periodic function as a linear combination of [[orthogonal]] [[sine]] and [[cosine]] functions.

The Fourier [[series (mathematics)|series]] of a function ''f(t)'' is of the form:

The Fourier [[series (mathematics)|series]] of a function ''f(t)'' is of the form: