I'm using derivatives sometimes, but never remember the formulae, so here it goes, a page with them:
You can also try this wonderful online calculator. It calculates derivatives, integrates, finds maximums and minimums, and a lot more things. Just write your problem and let it work for you.
How do you get to the math calculator from https://www.mathematics.com@ -- Kinsen
Hmm, good question... There are some good calculators on calculator.com, but Im not sure.... -- Jokester