Talk:Trigonometry/For Enthusiasts/Doing without Sine

Utility?
I'm not sure that this page is very useful. It does no more than make some easy substitutions to replace sin with cos. Equally, we can always replace cos with sin.--Wisden (talk) 11:58, 2 January 2011 (UTC)

I agree. It originally came from an author long ago who was trying to do a minimal derivation of everything trig (all on one page!), so only defining cos to start with. The way the book is shaping up now it would be hard for a reader to not grasp the close relation between sine and cosine. I'm fine with this moving to the scrap heap. --JamesCrook (talk) 17:55, 2 January 2011 (UTC)
 * Done.--Wisden (talk) 22:17, 4 January 2011 (UTC)