This button attempts to remove any redundant parts in the main window.
Things such as 'a-a' will be replaced with zero, 'a*a' with a� and so
on.

It is best to press this button occasionaly during work as it removes
any little ineficiencies that may have built up.

Simplify can also be used to remove a pair of "squigely" {} brackets.
Click on the bracket then press SIMPLIFY. Squigly brackets are unlike
round () brackets in that the computer will not normaly remove them
when they are redundant. This allows you too group terms together.