User talk:80.233.42.113

November 2018
Please refrain from making unconstructive edits to Wikipedia, as you did at Law of cosines. Your edits appear to constitute vandalism and have been reverted. If you would like to experiment, please use the sandbox. Repeated vandalism may result in the loss of editing privileges. Thank you. - Arjayay (talk) 12:29, 15 November 2018 (UTC)