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I use the MathKey app, which adds a handwriting math equation creator feature to the keyboard. It works great with GoodNotes. I create complex physics, calc and chem equations all the time on this app. Simply hand write the equation and the keyboard converts it to an equation that can be pasted as text.

It would be also cool, if the app can draw math funktion a like this: y=2x^2*3 or something like this

Definitely a great idea, I know plenty of Engineering students that would be more inclined to buy the app if it had more math functions. Grids 2&3d (perspective) of course, vector creators, matrix with customizable grid, be able to shrink and enlarge the grid, etc. Would be even willing to pay if it were to be an add on because upper level courses are fast so these features would definitely optimize time management in class.

It would be a great improvement