Talk:Trigonometry/Remembering Trig Formulae

This page is out of order! The link is wrong at the bottom

Robinson0120 This page could do with a few graphs and maybe a few different explanations of why the identities exist (i.e., unit circle example of x^2 + y^2 = 1 and addition of opp/hyp instead of A/C off the top of my head). I'll get started on the explanations a little later, but the graphs are out of my hands. If whoever added the previous trigonometric function graphs could help out here, that would be great.


 * Secondary Note: Link at bottom fixed.

Misleading page name & Merger proposal
The page name "Using fundamental identities" implies that the page will show examples of how to use them. Instead, it just lists the fundamental identities and in one case derives it. As the page stands now, I think a better page name would be "Fundamental identities".

Also, I think this list of identities should appear earlier in the book -- I think it would be a good idea to merge this page into the page entitled Trigonometric Identities, which currently does nothing more than define "identity". Douglas W. Mitchell (talk) 16:09, 27 August 2010 (UTC)

Nemonic for trig identities
I know Soh-Cah-Toa is the popular one today; but I wonder if possibly others should be given in case some finds one easier than the another. Not everyone will find the same nemonic works for them.

For instance, the one I learned gives the formulas for all 6 identities: Sin, Cos, Tan, Cot, Sec, Csc and is:  oh ah oh-ah ah-oh ha ho;  where for example the spoken 'oh' is for o/h -and- 'oh-ah' is oh over ah or o/a.

Just the 1st 3 are easy to say; oh ah oh-ah. Saying all six is not as easy for some people. You need to practice saying it for some 10-15 min. But I still remember it after 45 years and personally prefer it. I am sure there must be others. Bob.A51 (discuss • contribs) 10:14, 6 November 2013 (UTC)