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Introduction and Summary
 
 
Terms
 
 
Approximating Functions With Polynomials
 
 
Problems
 
 
The Remainder Term
 
 
Problems
 
 
Some Common Taylor Series
 
 
Problems
 
 
Differentiation and Integration of Power Series
 
 
Problems
 
 
 
 
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The Taylor Series

 
 

Differentiation and Integration of Power Series

 
Polynomials are easy to differentiate and integrate, applying the respective sum rules a finite number of times to reduce to the case of a monomial. We would like to be able to do the same thing for power series (including Taylor series in particular). It is a theorem that this always works within the radius of convergence of the power series. We state the result below.
 
Suppose f (x) = anxn is a power series with radius of convergence r. Then for all x with | x| < r,
 

f'(x) = nanxn-1    

and
 

f (x)dx = C + xn+1    

where C is an arbitrary constant, reflecting the non-uniqueness of the antiderivative.
 
 
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