I'm asked to find the derivative of the function.

y = R / ( R^2 + 1)^(1/2)

Now I know i'm gonna have to use the quotient rule and incorporate the chain rule in the midst of it. My whole problem is simplifying afterwards. Will someone help me? Thanks

This is what I've got :

((r^2 + 1)^1/2 * 1 - ( r * (1/2)(R^2 + 1)^(-1/2) * 2r)) / r^2 + 1

How do I simplify this so it'll end up looking like

y' = (r^2 + 1)^(-3/2)

Thanks in advance