# Derivative of log(x^2+y^3) ?

1. Feb 19, 2008

### engstudent363

Derivative of log(x^2+y^3) ???

I'm familiar with the derivative of log x but not when x is raised to a power or when y is involved. Could someone offer some help? And if you know of a website that fully explains this please let me know. Thanks.

2. Feb 19, 2008

### Staff: Mentor

What is the general rule for taking a derivative of something in the form f(g(x)) ?

3. Feb 20, 2008

### engstudent363

I don't know, and I never will unless you tell me.

4. Feb 20, 2008

### d_leet

Do you have a calculus book? Have you ever used it? The derivative of a function of the form f(g(x)) is a very important topic and will certainly be covered in a calculus book, you shouldn't expect people to do your work for you.

5. Feb 20, 2008

### rocomath

Guess you'll never learn a damn thing.

6. Dec 6, 2010

### thenabforlife

Re: Derivative of log(x^2+y^3) ???

chain rule my friend. chain rule

7. Dec 7, 2010

### amaresh92

Re: Derivative of log(x^2+y^3) ???

if x and y are both independent variable then you have to go for partial derivative.

8. Dec 7, 2010

### Staff: Mentor

Re: Derivative of log(x^2+y^3) ???

thenabforlife and amaresh92: I strongly suspect that the original poster has been able to solve this problem somewhere along the line during the 34 months that have transpired since posting the problem. If not, the OP has bigger problems than the kind of help you two are offering.

Because sleeping threads should be left alone, I am locking this thread.