Tricky Derivative - I need quick help

  • Thread starter Thread starter dekoi
  • Start date Start date
  • Tags Tags
    Derivative
Click For Summary

Homework Help Overview

The original poster is working with a complex function involving exponential and polynomial terms, seeking an efficient method to find its first derivative in simplified form.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster has attempted product and quotient rules, logarithmic differentiation, and is considering first principles but is concerned about the complexity involved in each method.

Discussion Status

Participants are exploring various approaches to the problem, with some suggesting that breaking the function into parts may be necessary, while others express doubt about finding a simpler method. There is no explicit consensus on the best approach.

Contextual Notes

The original poster mentions a lack of familiarity with delta-epsilon definitions, which may limit their approach to using first principles.

dekoi
I am faced with the function:
[tex]f(x)=\frac{e^x(x^2+x+4)+e^{-x}(x^3-1)(x^8+1)}{(e^x+x^2+1)(x^6e^x+2)}[/tex]

Can anyone think of a QUICK, EFFECTIVE way of finding the first derivative of this function, in simplified form??

I have tried using the product/quotient laws, and I am now facing huge expanding! (The document is attached).
I am assuming that this is a very ineffective way of finding the derivative, so then I tried another method...
I used logarithmic differentiation, but I realized that in order to get it into simplified form I will have to do much factoring/expanding also.

Then I thought, maybe using first principles would be easier? But I haven't tried that method yet. I'm assuming it will also consist of a lot of expanding.

Without telling me to use "delta-epsilon" because I haven't learned that yet, how can I find this derivative?Thank you.
 

Attachments

  • Copy of calculus.jpg
    Copy of calculus.jpg
    29.3 KB · Views: 546
Last edited by a moderator:
Physics news on Phys.org
I would break it up and brute force it. I don't see any shortcuts.
 
:eek:




Anyone else?... Please......
 
I don't see anything that can be done to make this less painful.
 
You might (??) gain some simplicity by multiplying out all of the polynomials before plug-n-chug...
 
I guess I will have to...
 
sometimes don't you just want to hug maple :)
 

Similar threads

Replies
5
Views
2K
Replies
26
Views
5K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
9
Views
2K
Replies
22
Views
3K
Replies
16
Views
2K
  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
5
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K