Welcome to Wikipedia!
Hyperbolic Function Identity
The identity cosh² t – sinh² t = 1 is shown in Hyperbolic function#Similarities to circular trigonometric functions section.
However you may be right it should be in some more 'visible' place, like Useful relations section. I'm going to restore it.
Possibly the identity could have a separate article, like the analogous Pythagorean trigonometric identity...? --CiaPan (talk) 11:56, 14 October 2008 (UTC)
Removal of PROD from Interestingness
Hello TV4Fun, this is an automated message from SDPatrolBot to inform you the PROD template you added to Interestingness has been removed. It was removed by Snigbrook with the following edit summary '(proposed deletion shouldn't be used; it could be nominated at Wikipedia:Redirects for discussion)'. Please consider discussing your concerns with Snigbrook before pursuing deletion further yourself. If you still think the article should be deleted after communicating with the 'dePRODer,' you may want to send the article to AfD for community discussion. Thank you, SDPatrolBot (talk) 21:41, 3 October 2009 (UTC) (Learn how to opt out of these messages) 21:41, 3 October 2009 (UTC)