From the preface, "These are notes for a course in precalculus, as it is taught at New York City College of Technology - CUNY (where it is offered under the course number MAT 1375). Our approach is calculator based. For this, we will use the currently standard TI-84 calculator, and in particular, many of the examples will be explained and solved with it. However, we want to point out that there are also many other calculators that are suitable for the purpose of this course and many of these alternatives have similar functionalities as the calculator that we have chosen to use. An introduction to the TI-84 calculator together with the most common applications needed for this course is provided in appendix A. In the future we may expand on this by providing introductions to other calculators or computer algebra systems."
Thomas Tradler, Holly Carley
New York City College of Technology
Thomas Tradler, Holly Carley, “Precalculus,” Open Educational Resource (OER) , accessed October 22, 2020, http://oer.iain-padangsidimpuan.ac.id/items/show/2545.