It is really easy and simple to learn. Just continue with however you said the equations in your math class or daily lives. The only difference is that if you want a '(' open bracket you should say "bracket" and if you want a ')' close bracket you should say "close". Also, it is critical to note that for functions like sin, cos, log, and so on (or the ones that you have saved), the calculator automatically puts a open bracket. For example you don't need to say sin "open" x "close".

Since the calculator automatically adds the open bracket, you only need to say sin x "close" to get sin(x).