(d) By considering higher order derivatives of f(x), we can repeat the above step of finding an additional explicit term for our discrepancy g(x) an infinite number of times. Adding all these terms up, we find an infinite sum/series equal to the exact value f(x) at some point x # xo. What is this infinite sum that equals to f(x) in terms of f(xo), its derivatives, x, and ao? Note: Some of you may recognise the resultant series in (d). Do not invoke this series from the beginning of this problem – the goal of the problem is to derive and justify the series in the first place.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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### Problem 1:

Consider some arbitrary function \( f(x) \), whose value and whose derivative values of every order are already known at some point \( x_0 \). We can approximate the function value \( f(x) \) with \( f(x_0) + f'(x_0)(x - x_0) \) for points \( x \) that are very close to \( x_0 \).

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(d) By considering higher order derivatives of \( f(x) \), we can repeat the above step of finding an additional explicit term for our discrepancy \( g(x) \) an infinite number of times. Adding all these terms up, we find an infinite sum/series equal to the exact value \( f(x) \) at some point \( x \neq x_0 \). What is this infinite sum that equals to \( f(x) \) in terms of \( f(x_0) \), its derivatives, \( x \), and \( x_0 \)?

**Note:** Some of you may recognise the resultant series in (d). Do not invoke this series from the beginning of this problem - the goal of the problem is to derive and justify the series in the first place.
Transcribed Image Text:### Problem 1: Consider some arbitrary function \( f(x) \), whose value and whose derivative values of every order are already known at some point \( x_0 \). We can approximate the function value \( f(x) \) with \( f(x_0) + f'(x_0)(x - x_0) \) for points \( x \) that are very close to \( x_0 \). --- (d) By considering higher order derivatives of \( f(x) \), we can repeat the above step of finding an additional explicit term for our discrepancy \( g(x) \) an infinite number of times. Adding all these terms up, we find an infinite sum/series equal to the exact value \( f(x) \) at some point \( x \neq x_0 \). What is this infinite sum that equals to \( f(x) \) in terms of \( f(x_0) \), its derivatives, \( x \), and \( x_0 \)? **Note:** Some of you may recognise the resultant series in (d). Do not invoke this series from the beginning of this problem - the goal of the problem is to derive and justify the series in the first place.
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