1 "Fișier:Calculus_Made_Easy_-_Fig_6a.png".

Fișier:Calculus Made Easy - Fig 6a.png

=14x}.}} |date=1914 |source=https://en.wikisource.org/wiki/Page:Calculus_Made_Easy.pdf/48 |author=Silvanus Phillips Thompson |permission= |other versions=...