I often recommend the Digilent Analog Discovery to newcomers. It provides a ton of capability in a reasonably priced piece of equipment.
My grandson is taking Pre-Calculus and the current topic is trigonometric functions. As a side issue, we're talking about differential and integral calculus at a beginning level. I cooked up a project to tie all of it together by using my analog computer to generate sin(t) and cos(t). This is pretty easy with 2 op amp integrators and an op amp inverter. Once you generate the functions, you can plug them into an X-Y scope and see the resulting circle. Plug sin(t) into the Y axis and cos(t) into the X axis. Along the way I decided to display the results with the Analog Discovery because it can handle waveforms that repeat at 6.28 (2 PI) seconds. The X-Y on the DS1054Z is pretty nice but I can't get enough persistence to see the closed form of the circle. Probably user error...
Anyway, I have attached a screen shot of the time domain and X-Y graphs on the same screen. Yes, the time domain is a little scrunched because I wanted the circle to display as 'round' but I can deal with it.
See attached screenshot. Yes, I really like the Analog Discovery!