What do pirates like to say? yong_saOctober 23, 2007 General No Comments The Derivative of r^2/2 ! Hee hee! ← Time is precious In a puff of smoke, it was gone. → Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.