## How do you find the Taylor polynomial?

Given a function f, a specific point x = a (called the center), and a positive integer n, the Taylor polynomial of f at a, of degree n, is the polynomial T of degree n that best fits the curve y = f(x) near the point a, in the sense that T and all its first n derivatives have the same value at x = a as f does.

**What is the Taylor series of a polynomial?**

A Taylor series is a clever way to approximate any function as a polynomial with an infinite number of terms. Each term of the Taylor polynomial comes from the function’s derivatives at a single point.

### What is Taylor expansion used for?

The Taylor series can be used to calculate the value of an entire function at every point, if the value of the function, and of all of its derivatives, are known at a single point.

**What is the difference between Taylor series and Taylor polynomial?**

The difference between a Taylor polynomial and a Taylor series is the former is a polynomial, containing only a finite number of terms, whereas the latter is a series, a summation of an infinite set of terms, any number of which (including an infinite number) may be zero.

## How are Taylor series used in real life?

The Taylor series is useful because it gives a framework for approximating functions. They require numerical methods and analysis in order to approximate the solution and therefore be used to predict behavior. These numerical methods are almost exclusively derived using Taylor series to approximate derivatives.

**Why do we need series expansion?**

It is a method for calculating a function that cannot be expressed by just elementary operators (addition, subtraction, multiplication and division). The resulting so-called series often can be limited to a finite number of terms, thus yielding an approximation of the function.

### Can you combine Taylor series?

A Taylor series is a polynomial of infinite degrees that can be used to represent all sorts of functions, particularly functions that aren’t polynomials. It can be assembled in many creative ways to help us solve problems through the normal operations of function addition, multiplication, and composition.

**Can I multiply series?**

Even if both of the original series are convergent it is possible for the product to be divergent. The reality is that multiplication of series is a somewhat difficult process and in general is avoided if possible.