- #1

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## Homework Statement

## Homework Equations

## The Attempt at a Solution

I don't know where to even start as this is my first time ever seeing this problem. Where should I start?

- Thread starter Bman900
- Start date

- #1

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I don't know where to even start as this is my first time ever seeing this problem. Where should I start?

- #2

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If that is the case then its a fairly easy problem.

If you have not met partial differentiation before I wont go through what it is and how it comes about but i'll just tell you how to do it:

To differentiate du/dx (with curly d's to represent partial derivatives) you take all the variables which are not x and treat them as constants so for example d/dx (x^2yz)=2xyz

As with the minus signs you just need to find the derivatives and then multiply it by -1 .

Hopefully that helps a little.

- #3

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so like this?

If that is the case then its a fairly easy problem.

If you have not met partial differentiation before I wont go through what it is and how it comes about but i'll just tell you how to do it:

To differentiate du/dx (with curly d's to represent partial derivatives) you take all the variables which are not x and treat them as constants so for example d/dx (x^2yz)=2xyz

As with the minus signs you just need to find the derivatives and then multiply it by -1 .

Hopefully that helps a little.

But since am treating yz as constants wouldn't it be 0 if I take the derivative or am just taking the derivative of x and then multiplying it by yz?

- #4

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Ok so I read up on partial derivatives and came up with this:

Am I right?

Am I right?

- #5

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[tex]\frac{\partial }{\partial x} ( xyz ) = yz[/tex]

As you know

[tex]\frac{d}{dx} ( \alpha x ) = \alpha[/tex]

Remember: when you differentiate a constant

- #6

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I really do appreciate the help here! Now is this any better?

- #7

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Looks great, nice work!

- #8

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Spot on buddy, hopefully you understand partial derivatives now if not try reading:

http://tutorial.math.lamar.edu/Classes/CalcIII/PartialDerivsIntro.aspx its a really useful maths website.

http://tutorial.math.lamar.edu/Classes/CalcIII/PartialDerivsIntro.aspx its a really useful maths website.

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