<p>To enter log you can either go through the catalog or just type out “log”; it’s short enough. I also installed an autocomplete app that lets you just type the first few letters of a function and it’ll offer to complete it for you. That and a program that completes missing parentheses on functions also drastically improves my speed.</p>
<p>To get an approximate answer, hit the green diamond key, and then hit enter. There should also be an option in the settings that lets you either do auto, approx., or exact. Auto will simply simplify an expression if there are no decimals. If there are any, then it will answer in decimals. Auto is most convenient as you can just enter sin 60. with a period, and it’ll give you an approximate answer.</p>