Ask HN: What tool for live, collaborative, symbolic math?

I've been doing Zoom meetings where we use live Overleaf to talk through math equations. This is cumbersome at best. I need a tool that I can use to talk with one or two remote mathematicians while we're visualizing and editing equations live.

Hand-drawing the equations, like you would do on Zoom's whiteboard, is not great. We all have mouse & keyboard interfaces, and mouse-drawn square-root symbols and subscripts leave a lot to be desired. Also, we copy and paste equations and modify them. The whiteboard interface has a struggle with this as well. The mouse-drawn stuff tends to be too large; we can't fit enough on screen.

What tool would you recommend for this scenario? A bonus would be to have something like a mini Desmos calculator on the side, where I can drop (in)equations and get them rendered.