# 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

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