Results 1 to 3 of 3

- January 22nd 2013, 03:21 AM #1

- Joined
- Jan 2013
- From
- Pizza
- Posts
- 57

- January 22nd 2013, 05:49 AM #2

- January 22nd 2013, 06:16 AM #3

- Joined
- May 2006
- From
- Lexington, MA (USA)
- Posts
- 12,013
- Thanks
- 827

## Re: x/x^2lnx

Hello, Boo!

You need Logarithmic Differentiation.

We have: .

Take logs: .

. . . . . . . .

. . . . . . . .

. . . . . . . .

Differentiate implicitly:

. . . . . . . .

. . . . . . . .

. . . . . . . .

. . . . . . . .

Hence: . .

Now repeat the process to find the second derivative,