She does not like it when you ask trivial questions, such as when I asked her how two variables can be constant at the s

She does not like it when you ask trivial questions, such as when I asked her how two variables can be constant at the same time in a product of two partial derivatives. The only resources she provided us to rely on were her own notes which she would write on the board and have us copy, and the book, this was tedious, sometimes wordy and not very helpful to a fresher. She would provide very thorough derivations, definitions and descriptions, which were quite insightful.