Per WGU's published description, C657 is the study of calculus conducted in three-or-higher-dimensional space, covering the knowledge and skills necessary to apply calculus of multiple variables while using appropriate technology to model and solve real-life problems. The topic list is unusual and worth reading twice: infinite series and convergence tests, integral, comparison, ratio, root, and alternating, then power series and Taylor polynomials, then vectors, lines and planes in three dimensions, dot and cross products, multivariable functions, limits and continuity, partial derivatives, directional derivatives, gradients, tangent planes, normal lines, and extreme values. Many programs split that across two courses; here it is 2 CUs in one term, with Calculus II stated as the prerequisite.
One catalog table carries C657: term 4 of the Master of Arts in Mathematics Education (Secondary), beside Linear Algebra, Abstract Algebra, and C886 Advanced Calculus, the term where the mathematics gets as abstract as the degree ever asks. Naming note: the bachelor's path covers the multivariable material as D892 Multivariable Calculus (MATH 3120, 3 CUs), and C612 elsewhere on this track lists Calculus III as recommended preparation. Message us the code and where you stand, and we quote a flat price in writing.