correct me if im wrong but i tried getting some of the books and it looks like they're only available to "registered teachers"?
that doesn't sound open to me
that doesn't sound open to me
It' s strange because 'Trigonometry' downloaded but the file I got was mfg.pdf — Modeling Functions and Graphs. So I don't know what's going on. I can only assume that there's some mixup in their files upload.
If you get it to work then signal as such and I'll try again. Good luck.
For Trigonometry check the page again. The page it links to (for the one simply titled "Trigonometry" author Katherine Yoshiwara) there are multiple books available. The second book on that page is Trigonometry. Modeling, Functions, and Graphs is the first book, just below it is Trigonometry: https://github.com/byoshiwara/trig/blob/master/trig.pdf.
Also, why didn't the download button work or do anything?