# سلسلة Taylor$\ frac {\ sin x} {x}$

## Power series

where a n represents the coefficient of the nth term and c is a constant. Power series are useful in mathematical analysis, where they arise as Taylor series of infinitely differentiable functions.In fact, Borel's theorem implies that every power series is the Taylor series of some smooth function. In many situations c (the center of the series) is equal to zero, for instance when considering ... In mathematics, a Fourier series (/ ˈ f ʊr i eɪ,-i ər /) is a periodic function composed of harmonically related sinusoids, combined by a weighted summation.With appropriate weights, one cycle (or period) of the summation can be made to approximate an arbitrary function in that interval (or the entire function if it too is periodic).As such, the summation is a synthesis of another function. Fourier series