Chapter 44
A First Course in Differential Equations with Modeling Applications by Dennis G. Zill. 12 ed. Metric version. 2024. Cengage learning.

44.1 Chapter 1. Introduction to differential equations. Exercises 1.1 at page 12
44.2 Chapter 1. Introduction to differential equations. Section 1.2 Initial value problems. Exercises 1.2 at page 19
44.3 Chapter 1. Introduction to differential equations. Review problems at page 34
44.4 Chapter 2. First order differential equations. Section 2.1 Solution curves without a solution. Exercises 2.1 at page 44
44.5 Chapter 2. First order differential equations. Section 2.2 Separable equations. Exercises 2.2 at page 53
44.6 Chapter 2. First order differential equations. Section 2.3 Linear equations. Exercises 2.3 at page 63
44.7 Chapter 2. First order differential equations. Section 2.4 Exact equations. Exercises 2.4 at page 71