Talk:Pythagorean trigonometric identity

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Do this subject have any content that shouldn't just be part of Trigonometric identity? If this stays as a separate article, it needs a 'lot' more explanatory text. ike9898 21:06, Nov 23, 2004 (UTC)

[edit] use of square roots in the proof is DODGY

basically the way things are shown here only holds for angles in the base region despite the fact the identity is valid for all angles Plugwash 23:36, 21 Dec 2004 (UTC)

[edit] Explanation needed

"They can be derived from (1) using simple algebra" How do the 2nd and 3rd identities come from (1)?, show me the algebra required to convert them.Bdodo1992 13:43, 27 July 2007 (UTC)