## Calculus: Early Transcendentals (2nd Edition)

The derivative of $f$ at $x$ can be denoted as $$f'(x),\quad \frac{df}{dx},\quad D_x(f(x))$$
The derivative of $f$ at $x$ can be denoted as $$f'(x),\quad \frac{df}{dx},\quad D_x(f(x)).$$ The first notation is due to Newton, the second is due to Leibnitz and the third is probably due to Euler.