- Allowing implicit multiplication e.g.: 4x+1 = 4 * x + 1
- Allow calculation using degree instead of rad
- When pressing "ENTER" n times with a void equation and you enter a valid equation afterwards, you have to press "ENTER" n + 1 times to get the eqn drawn.
- the term "(-1)^x" will not display any result, for you cannot define x as a natural number