trs/TODO

# vim: set fileencoding=utf-8 :
- Last possibilities reduce to a similar result.

- ExpressionNode.equals() werkend maken voor alle cases (negatie).

- Create unit tests for node inequivalence operator.

- Line printer: 1 / (n + n)x  ->  1 / (n + n) * x

- Modules:
  + Equations with substitution
  + Gonio, no matches for sin(pi), sin(2pi), sin(4pi), etc...

- Fix: int -cf(x) dx (caused infinite loop)
  Solution: remove baby steps that rewrites f(x) to f(x) ^ 1

- Add backslash notation for special LaTeX symbols notation such as \pi?

- Change integral representation in parser so that _ and ^ bounds are printed correctly by line printer.

- Rewrite unit tests to use improved line printer syntax.

- Add notation "1 1/3" for 'int with fraction' leafs, and rules to rewrite them to fractions and back.

- frontend: replace 'dx' with '(dx)' with regex before sending to parser

- "sin^2 x" is supported by parser, but not yet by line printer.

- "Division by 1 yields the nominator." verwijdert negatie
- Raise constant -3 with 3 -> 27 ipv -27.
- 1/x + 2/(x+1) -> (3x + 1) / (x(x + 1)):
  a/b + c/d  ->  ad/(bd) + bc/(bd)  ->  (ad + bc)/(bd)

- To work 100% correctly, POW and SUB (^ and _) should have a precedence equal to INTEGRAL when used for integral bounds.
- Give FUNCTION higher precedence than POW? -> "sin(x) ^ 2 == (sin x) ^ 2" rather than "sin(x ^ 2)" (which it is now).