Is your feature request related to a problem? Please describe.
Typing raw latex for math is not something very effective, especially when there is no realtime preview.
Describe the solution you’d like
Typora has a latex realtime preview, we could make something similar.
Describe alternatives you’ve considered
Even with a latex realtime preview, typing raw latex is still not a good experience. There are two possible solutions:
Besides latex, also support AsciiMath mode, which is aiming for easy-to-write. http://asciimath.org/
Another possible solution is MathQuill mode. https://github.com/mathquill/mathquill