How would one go about proving a trig identity(choose one) by using commutative ring theory?. PH, this looks like a good one for you.
There was an article in the Mathematical Gazette regarding this, but I didn't get to see it. An old issue.
It is vol. 47, no. 4, September 1974, pages 226-227
Pretty old issue. If you have it, that'd be cool.
There is a book out by MAA entitled, "The Harmony of the World, 75 years of Mathematics Magazine".
It is a complialtion of the best of Math Magazine. The aforementioned is one of the articles.
I found this on the internet:
It is the article, but they want $12 for it. It's in JSTOR.
The book I mentioned would be nice to have, but I am not paying $45 for it.