Calculus is designed for the typical two- or three-semester general calculus course, incorporating innovative features to enhance student learning. The book guides students through the core concepts of calculus and helps them understand how those concepts apply to their lives and the world around them. Due to the comprehensive nature of the material, we are offering the book in three volumes for flexibility and efficiency. Volume 3 covers parametric equations and polar coordinates, vectors, functions of several variables, multiple integration, and second-order differential equations.
The final part of the openstax calculus series, this textbook covers multivariable calculus, typically the third semester of a university calculus course. I would say that I prefer this textbook over Stewart's calculus, as it gives a more in-depth treatment of the later topics, and proves almost all of its results, with several minor typos here and there.