User talk:106.217.190.3

January 2024
Please do not add or change content, as you did at List of trigonometric identities, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. - DVdm (talk) 10:29, 10 January 2024 (UTC)

Note: see also - DVdm (talk) 10:29, 10 January 2024 (UTC)