Find the derivative:
My answer is
I can show work later if needed if this is wrong. Just need to be sure I did this one right before I go on and do others.
By definition as h goes to 0.I first changed . Plugged that in and got . Common denominator is . Then it becomes . Then . Then . Then Substitute in for and you are left with
Edit: Looks like 2 crosses out in the numerator so you are left with ... hows this?