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What is a difference between a Taylor polynomial and the Taylor series for a function f at a point x0?

Short Answer

Expert verified

So,aTaylorpolynomialofdegreenisapproximationtothefunctionfatx=x0.ItispossibleforaTaylorseriesforafunctionftoconvergetofontheintervalofconvergencefortheseries.Inotherwords,aTaylorpolynomialisanalternatewaytorepresentthefunctionoftheintervalofconvergence.ButthisapproximationbyTaylorpolynomialofthefunctionfimprovesasthedegreeofthepolynomialincreases.

Step by step solution

01

Step 1. Given information is:

A function f with Taylor polynomial and the Taylor series

02

Step 2. Taylor polynomial 

Foranyfunctionfwithderivativeofordern,thentheTaylorpolynomialofdegreenatx=x0is,Pn(x=x0)=f(x0)+f'(x0)(x-x0)+f''(x0)2!(x-x0)2+....+fn(x0)n!(x-x0)nThegeneralformTaylorpolynomialofdegreenofthefunctionfis:Pn(x)=∑k=0nfk(x0)k!(x-x0)k

03

Step 3. Taylor Series

Foranyfunctionfwithderivativeofordern,thentheTaylorseriesatx=x0is,Pn(x=x0)=f(x0)+f'(x0)(x-x0)+f''(x0)2!(x-x0)2+.....ThegeneralformTaylorseriesofthefunctionfis:Pn(x)=∑k=0∞fk(x0)k!(x-x0)k

04

Step 4. Result

So,aTaylorpolynomialofdegreenisapproximationtothefunctionfatx=x0.ItispossibleforaTaylorseriesforafunctionftoconvergetofontheintervalofconvergencefortheseries.Inotherwords,aTaylorpolynomialisanalternatewaytorepresentthefunctionoftheintervalofconvergence.ButthisapproximationbyTaylorpolynomialofthefunctionfimprovesasthedegreeofthepolynomialincreases.

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