A 16-Year-Old Asks: How Can I Apply Taylor Series to Delta-F?

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Discussion Overview

The discussion revolves around the application of Taylor series to calculate a finite change in a function, denoted as delta-F, within the context of mechanics. Participants explore how Taylor series can be utilized to approximate function values and clarify the concept for a younger audience.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • A participant seeks to understand how to apply Taylor series to delta-F, indicating familiarity with its use in common functions like e^x, sinx, and cosx.
  • Another participant provides the Taylor series expansion and suggests that by truncating higher-order terms, an approximation can be made for delta-y, relating it to delta-F.
  • There is a suggestion that keeping higher-order terms can yield a more accurate approximation, with a note on the importance of the radius of convergence for the series.
  • A link to additional resources on Taylor series is shared for further exploration.

Areas of Agreement / Disagreement

Participants generally agree on the method of using Taylor series for approximation, but there is an acknowledgment of the conditions under which the series converges and the accuracy of the approximation based on the number of terms used.

Contextual Notes

The discussion does not resolve the specifics of which functions may or may not converge well with Taylor series, nor does it clarify the limitations of the approximation in various contexts.

Who May Find This Useful

Individuals interested in mechanics, calculus, or mathematical approximations, particularly students seeking to understand the application of Taylor series in practical scenarios.

richardlhp
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Hi! I am a 16 year old trying to figure out the application of taylor series. I understand most of its uses when applied to functions like e^x, sinx, cosx, but in a mechanics book, i am required to find delta-F, a finite change in a function F. Ostensibly, this appears to be a step that needs the application of taylor series, so can anyone help me to explain slowly and clearly how taylor series can be applied to delta-F? (sorry i do not know how to use symbols and stuff)
 
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f(x) = f(a) + \frac{f'(a)}{1!}(x-a) + \frac{f''(a)}{2!}(x-a)^2+...

If you lop off the higher order terms you have the approximation

f(x) \doteq f(a) + \frac{f'(a)}{1!}(x-a)

or

f(x) - f(a) \doteq f'(a)(x-a)

If x = b you have

f(b) - f(a) \doteq f'(a)(b-a)

In the delta-y notation you might write this as

\Delta y \doteq f'(x)\Delta x

Is that what you are getting at?
 
Yeah! Thanks a lot. Hence for a more accurate value, one can keep the higher order terms?
 
richardlhp said:
Yeah! Thanks a lot. Hence for a more accurate value, one can keep the higher order terms?

Yes, exactly, as long x is within the radius of convergence from a. Many functions have good approximation with just a few terms for x near a but not every function's Taylor series converges to it.
 

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