The first three chapters of this book are mainly taken from chapters 5, 6, and 7 of the open source calculus textbook titled APEX calculus, Version 5.0, by Gregory Hartman, department of applied mathematics, Virginia Military Institute. The chapter on differential equations is authored by Ross Magi, available in chapter 20 of this version of the text. The complete calculus book is under the Creative Commons Attribution- NonCommercial-Share-Alike 4.0 International License. It is available for free at www.apexcalculus.com. The chapters on more applications and multivariate calculus are taken from Math 1274 lecture notes and the Multivariate calculus notebook, by Pichmony Anhaouy, department of mathematics and statistics, Langara College. The exercises for each section of these chapters are taken from Math 1274 problems book and Exercises multivariate calculus, by Ken Collins and Pichmony Anhaouy.
