On the right hand side of the top menu, select More and then Highlight equivalence.
You can type expressions on a whiteboard and equivalent expressions will be highlighted in the same colour – brilliant.
Here’s a good way to demonstrate the feature – a problem from Don Steward.
The highlight equivalence feature is excellent for checking work. Equivalent equations and expressions are highlighted the same colour as we have seen, so a great way to check the steps in solving an equation for example.
Or the correct order of operations…