# Implicit Differentiation: two different answers

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1. Aug 12, 2015

### funlord

1. The problem statement, all variables and given/known data

2. Relevant equations
use implicit differentiation

3. The attempt at a solution
I always get this answer

but not the second one

PLs explain the second answer for I am very desperate.
Thank You

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2. Aug 12, 2015

### JorisL

Use what you begin with i.e. $(x-y)^3 = (x+y)^2$ inside the expression you get from implicit differentiation

3. Aug 12, 2015

### SammyS

Staff Emeritus
Please state the entire problem.

4. Aug 26, 2015

### Kilgour22

In order to get the second answer, you need to take the ln of both sides of the equation, then differentiate implicitly. After rearranging, if done right (presumably the second answer is correct), you should have the same answer.