# Math Help - Simple problem

1. ## Simple problem

What's F'(x)? Is it just x^2-1 ?

2. Originally Posted by gralla55
What's F'(x)? Is it just x^2-1 ?

As F is a primitive of f, $F'(x)=f(x)=\ln(x^2-1)$

Tonio

3. Yes of course, that's what I thought and what I meant to write. Thanks!