# Find the derivative.

1. Jan 28, 2012

### neosonata

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

Find the derivative. Simplify where possible.

xtanh-1x + ln$\sqrt{1-x^2}$

2. Relevant equations

3. The attempt at a solution

(x/1+x2) + tanh-1x - (x/1-x2)

How would I go about make this problem simplified as possible if the above answer is correct.

Last edited: Jan 28, 2012
2. Jan 28, 2012

### tiny-tim

welcome to pf!

hi neosonata! welcome to pf!
nooo

that's for tan-1x

3. Jan 28, 2012

### Simon Bridge

4. Jan 28, 2012

### litup

Re: welcome to pf!

He must have written it wrong since that would just be X^3.

5. Jan 28, 2012

### neosonata

Ah that make sense.. silly me :p

it should be

(x/1-x^2) + tanh^(-1)x - (x/1-x^2)

which leaves

tanh^(-1)x

Thanks for the help guys