User talk:Billord73

August 2020
Hello, I'm DVdm. Your recent edit to List of trigonometric identities appears to have added incorrect information, so I removed it for now. If you believe the information was correct, please cite a reliable source or discuss your change on the article's talk page. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thank you. DVdm (talk) 11:57, 16 August 2020 (UTC)