Integral Calculus according to the times
http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/IntegPyraMD.html
[url=http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/IntegPyraMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/Export6/IntegPyraMD.html[/url]