Differentiation question with continuity

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Homework Help Overview

The problem involves a function f that is continuous and has continuous derivatives of all orders. It is given that the function satisfies the differential equation xf ''(x) + f '(x) + xf(x) = 0, with the initial condition f(0) = 1. The goal is to find the values of f '(0) and f ''(0).

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to evaluate the equation at x=0 to find f '(0) and questions how to determine f ''(0). Other participants suggest differentiating the original equation and evaluating it at x=0 for further insights.

Discussion Status

The discussion is ongoing, with participants exploring different approaches to derive the necessary values. Some guidance has been offered regarding differentiation, but no consensus has been reached on the final values.

Contextual Notes

The original poster expresses uncertainty about the status of f ''(0) and whether it is undefined, indicating a potential gap in information or understanding regarding the behavior of the function at that point.

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Homework Statement



Suppose a function f is continuous and has continuous derivatives of all orders for all
x. it satisfies xf ''(x) + f '(x) + xf(x) = 0. Given f(0) = 1

find the value of f '(0) and f '' (0).

Homework Equations


The Attempt at a Solution



when x=0,

0f''(0) + f ' (0) + 0f(0) = 0
therefore f ' (0) = 0

Now, I am not sure on how to find f ''(0). Is it undefined?
Thanks for your help.
 
Last edited:
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There's no attempt at a solution. You have to make one. Then you can get some help.
 
I have added the solution attempt, please help. Thanks :)
 
That helps. Try differentiating xf ''(x) + f '(x) + xf(x) = 0 and putting x=0 again.
 
Wow. Thanks Dick! :D
 

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