# Homework Help: How to take a derivative

1. Jul 10, 2010

### phillyolly

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

lim(x→∞)x^3 e^((-x)^2 )

2. Relevant equations

3. The attempt at a solution
So I tried taking a derivative as both, multiplication and a fraction. I make a mistake somewhere. I get a very complicated answer.

Last edited: Jul 10, 2010
2. Jul 10, 2010

### phillyolly

OK, I solved it.