(a-b)²=a²- 2ab +b²
http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/diffcarMD.html
http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/diffcarMD.html
[url=http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/diffcarMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/diffcarMD.html[/url]
Information: (a-b)²=a²- 2ab +b²