There are online calculators that will spit out the answer to this question, however if you want genuine help, we need to know what you've tried, or...
As I said before, please post calculus questions in our "Calculus" forum, and please don't begin a new thread for the same question. I have moved and...
Head of Mathematics Department, I.E.S. Sta Teresa, Madrid.
Prof. of Mathematical Methods, Univ. Alfonso X El Sabio, Madrid.
(Up until the 2008/2009 academic year. I am now devoted to investigation).