[x] Fix parsing with starting negative number
[] Allow for simp of the type Sin/Cos^2 -> Tan/Cos
[] Greek letters
[x] Sqrt operator
[] Taylor Expansion
[] New function from RPN syntax
[] New function from LATEX
[x] Allow sqrt syntax
[x] Print in latex
[] Find Local Min/Max (Maybe)
[] Fit function to points
[x] Turn f1d into f2d ecc...
[] Try convert from f3d to f1d...
[x] Add f2d+f3d ecc...
[] Generate N points in interval