User talk:201.17.87.68

April 2023
Hello, I'm Stuart98. An edit that you recently made to Total derivative seemed to be a test and has been reverted. If you want to practice editing, please use the sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page. Thanks! –  Stuart 98  ( Talk • Contribs) 22:38, 14 April 2023 (UTC)