Hi

I am trying to differentiate.

Many attempts at trying, and I cannot get to the answer. I am doing something wrong. Just having the answer is not helping. I have tried using the product and quotient rule(s) but am probably not simplifying correctly. If someone can show the steps that would really be great.

$\displaystyle \frac{x^2-1}{\sqrt{x^2+1}}$

Thanks

Regards

Craig.