My Math Forum Fun with the limit definition of the derivative!

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 December 10th, 2015, 07:09 PM #1 Member   Joined: May 2015 From: Earth Posts: 64 Thanks: 0 Fun with the limit definition of the derivative! So I have been using the limit definition of the derivative that involves h, and I have to find the derivative 1/(x+3) So I set the top to have common denominators, and then simplify a bit. I end up with -3/((x+h)(x+h+3), all of which is over h. I know this isn't correct. I'd go into greater detail but the math would look really ugly. How do I solve this? Do I use the other limit definition of the derivative?
 December 10th, 2015, 07:18 PM #2 Member   Joined: May 2015 From: Earth Posts: 64 Thanks: 0 Wait how do I delete this!

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