Calculate Notable Identities

The user can calculate the development of the most important notable identities: square of a sum, square of a difference, sum by difference,
cube of a sum and cube os a difference. To do this you have to introduce two monomials (a and b) and then you can see the development of the
notable indentities pressing the buttons.
The application shows the develpment of the notable identities, doing the operations step by step. The user can also see the formulae of the notable identities.