"fk378" <email@example.com> wrote in message news:24122684.1189967172314.JavaMail.firstname.lastname@example.org... > Oh, I see. Thank you. What's the advantage of writing d/dt over f'(x)? > Just easier to read or something else?
It depends on the notation. If you were given, or wish to define, the function f(t)=sin(t) then it makes sense to write f'(t)=cos(t). As you have it, there never was a function given (much less a function of t, not x) just an expression.