About Precalculus Archive

This blog is a collection of my precalculus lessons produced between 2010 and 2014. The original math websites relied extensively on Adobe Flash, which meant that as the browser plug-in was eradicated from the web, my websites became unusable. The constant security warnings "This page contains Adobe Flash and may not be secure" really drove away visitors to the websites, and usage was dwindling. Furthermore, as schools were rapidly removing Flash from their computers, Flash-based projects were - for all intents and purposes - depreciated to the digital garbage heap of educational history. By 2014, it was becoming clear that there was no future for Flash-based development, so I returned to teaching after finishing the Math 10C and Math 30-1 websites. There is no content for Math 20-1. Finally, in 2018 (shortly before Flash was fully banned from browsers), I pulled the websites off the web rather than face the daunting task of redoing years of work without Flash.

While this blog lacks the rich interactivity and visual aesthetic of the original Flash-based websites, there is still a lot of content that can be restored into educationally viable lessons. The PDF booklets and Desmos interactives are fully accessible, and screen captures of the Flash animations adequately convey the essential mathematical concepts. I plan on adding lessons to this archive when I have the time to do so, with the hope of having all the Math 10C and Math 30-1 lessons online by March 2025. Note that I've largely removed references to course names in this reposting of the material to safeguard from future course name changes. Thank you to the teacher who expressed encouragement that these lessons remain a useful resource in precalculus education.

Note about the Desmos interactives: The purpose of these interactives is for the teacher to toggle graphs on & off while explaining the solution in class. They are included as more of a presentation tool than a learning tool. For example, when teaching transformations, graphs can successively be toggled on from the base graph to show how a stretch, reflection, and translation are applied.

Also, I let the domain name registration for my earlier websites expire in 2021 (I really didn't anticipate ever putting this content back online). Since then, some of the domain names have been purchased by others whom are unknown to me. Therefore, anyone still using PDFs from my earlier websites are strongly encouraged to use the updated PDFs from this website moving forwards.