So I started learning Calculus a while ago and having this online derivative tool is very useful! Especially since I’m going to get an iPhone 
(I haven’t ever not mentioned that in posts)
Easy to use and operators and all that is intuitive:
Online Derivative Calculator.
Parent Site with other Math Tools
This here is a keyword tool to generate a list of keywords based on text that you copy and paste. It also prints the keywords in a comma-delimited list so that you can just copy and paste it as tags in WordPress. Very useful and easy to use.
Keyword Suggestions Tool
Ed
April 15, 2009 at 10:36 am
Hey, nice tips. I’ll buy a bottle of beer to that man from that chat who told me to visit your site
May 27, 2012 at 12:37 am
Im having a teeny problem. I cant get my reader to pick-up your rss feed, Im using msn reader by the way.