Mnemonic technics

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fl

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Oct 27, 2019, 9:43:31 AM10/27/19
to Metamath

I didn't know these mnemonic technics. I find them nice. I put them here.

> "Je donne également des mnémos pour retenir. Par exemple pour cos(a+b), penser à CO CO Si Si." 

https://twitter.com/QuangThaiNgo1

> We can find them here too:

> "Procédé mnémotechnique : retenir « coco-moins-sisi-sico-cosi » pour l'ordre des fonctions.

> Les produits cos(a)cos(b), sin(a)sin(b) et sin(a)cos(b) s'obtiennent à partir des formules d'addition." 

http://www.trigofacile.com/maths/trigo/etude/formulaires/essentiel-circulaire.htm


It works with hyperbolic trigonometry too.

Have all the trigonometric relationships been entered in metamath.

A keyword like "trigonometric relationships" could help to retrieve them easily.
We can also group them together.


-- 
FL
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