Call them "Steve" if you like. What difference does it make? Different forms have different conveniences. Learn to use all of them.
For starters, you seem to be missing the important word in your question. You have not provided any "function". You have provided "equations".
In my view, the ONLY reason to learn what the form is called is to get the question correct on an exam. After you pass the exam, you should become sufficiently familiar that the application will dictate the required form. Be fluent in all.