Understanding Multivariable Calculus: Problems, Solutions, and Tips
A Visual Introduction to 3-D Calculus
S1 E1:
Review key concepts from basic calculus, then immediately jump into three dimensions with a brief overview of what you’ll be learning. Apply distance and midpoint formulas to three-dimensional objects in your very first of many extrapolations from two-dimensional to multidimensional calculus, and observe some of the new curiosities unique to functions of more than one variable.