Part of my job as a Ph.d. student is to TA at the Niels Bohr Institute. In Spring 2017, I was a Teaching Assistant in the course "Mathematics for physicists 2". In this course, students learn mathematical methods like contour integration, how to solve differential equations using laplace transforms etc.
Since the course is all about methods and exercise solving, it made sense to produce videos (so called pencasts) in which I solved exercises using the key methods of the course, while explaining the procedure. I produced a total of 9 videos covering subjects from Laurent series to integration of trigonometric functions on the real axis.
The videos were fun to do and ended up getting good evaluations. They are all in Danish, and 7 of them are available on the course website online.