All the educational material that I have created and placed on this website is under my copyright.
It is, however, FREE for you to download, use and share (unaltered) with friends as long as you do not make commercial gain from it.
Note that this FREE offer DOES NOT APPLY to the WordPress software or related addons used to construct this site, nor to other (independent) websites to which we have provided hyperlinks. They all retain their respective copyrights.
I never understood calculus faster than I did from your 25 min video …
Ghadad B (on a CCM YouTube video about the Chain Rule)
See all Testimonials