The school where I earned my CS masters required those with non-CS undergrad degrees (like myself with a BS in a hard engineering field) to take 12 semester cre

The school where I earned my CS masters required those with non-CS undergrad degrees (like myself with a BS in a hard engineering field) to take 12 semester credits of additional coursework to make up for this fact. I'd say those three subjects account for about 9-10 of those credits. I suppose you could say they're important.