User talk:87.33.42.38

March 2009
Welcome to Wikipedia. The recent edit you made to the page Differential calculus has been reverted, as it appears to be unconstructive. Use the sandbox for testing; if you believe the edit was constructive, please ensure that you provide an informative edit summary. You may also wish to read the introduction to editing. Thank you. Kingpin13 (talk) 11:07, 31 March 2009 (UTC)